diff --git a/LICENSE b/LICENSE
index 144b986..b96dcb0 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,30 +1,21 @@
-BSD License
+MIT License
 
-For Prophet software
+Copyright (c) Facebook, Inc. and its affiliates.
 
-Copyright (c) 2017-present, Facebook, Inc. All rights reserved.
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
 
-Redistribution and use in source and binary forms, with or without modification,
-are permitted provided that the following conditions are met:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
 
- * Redistributions of source code must retain the above copyright notice, this
-   list of conditions and the following disclaimer.
-
- * Redistributions in binary form must reproduce the above copyright notice,
-   this list of conditions and the following disclaimer in the documentation
-   and/or other materials provided with the distribution.
-
- * Neither the name Facebook nor the names of its contributors may be used to
-   endorse or promote products derived from this software without specific
-   prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
-ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
-ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/PATENTS b/PATENTS
deleted file mode 100644
index 7442946..0000000
--- a/PATENTS
+++ /dev/null
@@ -1,33 +0,0 @@
-Additional Grant of Patent Rights Version 2
-
-"Software" means the Prophet software contributed by Facebook, Inc.
-
-Facebook, Inc. ("Facebook") hereby grants to each recipient of the Software
-("you") a perpetual, worldwide, royalty-free, non-exclusive, irrevocable
-(subject to the termination provision below) license under any Necessary
-Claims, to make, have made, use, sell, offer to sell, import, and otherwise
-transfer the Software. For avoidance of doubt, no license is granted under
-Facebook’s rights in any patent claims that are infringed by (i) modifications
-to the Software made by you or any third party or (ii) the Software in
-combination with any software or other technology.
-
-The license granted hereunder will terminate, automatically and without notice,
-if you (or any of your subsidiaries, corporate affiliates or agents) initiate
-directly or indirectly, or take a direct financial interest in, any Patent
-Assertion: (i) against Facebook or any of its subsidiaries or corporate
-affiliates, (ii) against any party if such Patent Assertion arises in whole or
-in part from any software, technology, product or service of Facebook or any of
-its subsidiaries or corporate affiliates, or (iii) against any party relating
-to the Software. Notwithstanding the foregoing, if Facebook or any of its
-subsidiaries or corporate affiliates files a lawsuit alleging patent
-infringement against you in the first instance, and you respond by filing a
-patent infringement counterclaim in that lawsuit against that party that is
-unrelated to the Software, the license granted hereunder will not terminate
-under section (i) of this paragraph due to such counterclaim.
-
-A "Necessary Claim" is a claim of a patent owned by Facebook that is
-necessarily infringed by the Software standing alone.
-
-A "Patent Assertion" is any lawsuit or other action alleging direct, indirect,
-or contributory infringement or inducement to infringe any patent, including a
-cross-claim or counterclaim.
diff --git a/R/DESCRIPTION b/R/DESCRIPTION
index 2b6f554..5237400 100644
--- a/R/DESCRIPTION
+++ b/R/DESCRIPTION
@@ -31,7 +31,7 @@ Suggests:
     knitr,
     testthat,
     readr
-License: BSD_3_clause + file LICENSE
+License: MIT + file LICENSE
 URL: https://github.com/facebook/prophet
 BugReports: https://github.com/facebook/prophet/issues
 LazyData: true
diff --git a/R/R/data.R b/R/R/data.R
index 79d803b..876fc4b 100644
--- a/R/R/data.R
+++ b/R/R/data.R
@@ -1,9 +1,7 @@
-## Copyright (c) 2017-present, Facebook, Inc.
-## All rights reserved.
+# Copyright (c) Facebook, Inc. and its affiliates.
 
-## This source code is licensed under the BSD-style license found in the
-## LICENSE file in the root directory of this source tree. An additional grant
-## of patent rights can be found in the PATENTS file in the same directory.
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 
 #' holidays table
diff --git a/R/R/diagnostics.R b/R/R/diagnostics.R
index e60037c..b420dbd 100644
--- a/R/R/diagnostics.R
+++ b/R/R/diagnostics.R
@@ -1,9 +1,7 @@
-## Copyright (c) 2017-present, Facebook, Inc.
-## All rights reserved.
+# Copyright (c) Facebook, Inc. and its affiliates.
 
-## This source code is licensed under the BSD-style license found in the
-## LICENSE file in the root directory of this source tree. An additional grant
-## of patent rights can be found in the PATENTS file in the same directory.
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 ## Makes R CMD CHECK happy due to dplyr syntax below
 globalVariables(c(
diff --git a/R/R/make_holidays.R b/R/R/make_holidays.R
index 4d36c62..3985caa 100644
--- a/R/R/make_holidays.R
+++ b/R/R/make_holidays.R
@@ -1,9 +1,7 @@
-## Copyright (c) 2017-present, Facebook, Inc.
-## All rights reserved.
+# Copyright (c) Facebook, Inc. and its affiliates.
 
-## This source code is licensed under the BSD-style license found in the
-## LICENSE file in the root directory of this source tree. An additional grant
-## of patent rights can be found in the PATENTS file in the same directory.
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 
 #' Return all possible holiday names of given country
diff --git a/R/R/plot.R b/R/R/plot.R
index 79bb345..7f7bc54 100644
--- a/R/R/plot.R
+++ b/R/R/plot.R
@@ -1,3 +1,8 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
 #' Merge history and forecast for plotting.
 #'
 #' @param m Prophet object.
diff --git a/R/R/prophet.R b/R/R/prophet.R
index ead91ea..a47cbab 100644
--- a/R/R/prophet.R
+++ b/R/R/prophet.R
@@ -1,9 +1,7 @@
-## Copyright (c) 2017-present, Facebook, Inc.
-## All rights reserved.
+# Copyright (c) Facebook, Inc. and its affiliates.
 
-## This source code is licensed under the BSD-style license found in the
-## LICENSE file in the root directory of this source tree. An additional grant
-## of patent rights can be found in the PATENTS file in the same directory.
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 ## Makes R CMD CHECK happy due to dplyr syntax below
 globalVariables(c(
diff --git a/R/R/zzz.R b/R/R/zzz.R
index 1d4d6a0..13c7678 100644
--- a/R/R/zzz.R
+++ b/R/R/zzz.R
@@ -1,9 +1,7 @@
-## Copyright (c) 2017-present, Facebook, Inc.
-## All rights reserved.
+# Copyright (c) Facebook, Inc. and its affiliates.
 
-## This source code is licensed under the BSD-style license found in the
-## LICENSE file in the root directory of this source tree. An additional grant
-## of patent rights can be found in the PATENTS file in the same directory.
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 .onLoad <- function(libname, pkgname) {
   .prophet.stan.model <- get_prophet_stan_model()
diff --git a/R/inst/stan/prophet.stan b/R/inst/stan/prophet.stan
index 7394840..79db33c 100644
--- a/R/inst/stan/prophet.stan
+++ b/R/inst/stan/prophet.stan
@@ -1,3 +1,8 @@
+// Copyright (c) Facebook, Inc. and its affiliates.
+
+// This source code is licensed under the MIT license found in the
+// LICENSE file in the root directory of this source tree.
+
 functions {
   matrix get_changepoint_matrix(vector t, vector t_change, int T, int S) {
     // Assumes t and t_change are sorted.
diff --git a/R/src/install.libs.R b/R/src/install.libs.R
index 84a0cd7..2ef314b 100644
--- a/R/src/install.libs.R
+++ b/R/src/install.libs.R
@@ -1,4 +1,7 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
 
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 packageStartupMessage('Compiling model (this will take a minute...)')
 
diff --git a/R/tests/testthat.R b/R/tests/testthat.R
index fd849b4..ba9c44c 100644
--- a/R/tests/testthat.R
+++ b/R/tests/testthat.R
@@ -1,3 +1,8 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
 Sys.setenv("R_TESTS" = "")
 library(testthat)
 library(prophet)
diff --git a/R/tests/testthat/test_diagnostics.R b/R/tests/testthat/test_diagnostics.R
index 0ec6b16..559b8b9 100644
--- a/R/tests/testthat/test_diagnostics.R
+++ b/R/tests/testthat/test_diagnostics.R
@@ -1,3 +1,8 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
 library(prophet)
 context("Prophet diagnostics tests")
 
diff --git a/R/tests/testthat/test_prophet.R b/R/tests/testthat/test_prophet.R
index 14548af..a638526 100644
--- a/R/tests/testthat/test_prophet.R
+++ b/R/tests/testthat/test_prophet.R
@@ -1,3 +1,8 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
 library(prophet)
 context("Prophet tests")
 
diff --git a/R/tests/testthat/test_stan_functions.R b/R/tests/testthat/test_stan_functions.R
index de2f2b6..41a17da 100644
--- a/R/tests/testthat/test_stan_functions.R
+++ b/R/tests/testthat/test_stan_functions.R
@@ -1,3 +1,8 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
 library(prophet)
 context("Prophet stan model tests")
 
diff --git a/README.md b/README.md
index 957d4bf..0114e0b 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,6 @@ Prophet is [open source software](https://code.facebook.com/projects/) released
 - Prophet Python package: https://pypi.python.org/pypi/fbprophet/
 - Release blogpost: https://research.fb.com/prophet-forecasting-at-scale/
 - Prophet paper: Sean J. Taylor, Benjamin Letham (2018) Forecasting at scale. The American Statistician 72(1):37-45 (https://peerj.com/preprints/3190.pdf).
-- Ask user questions on stackoverflow: https://stackoverflow.com/questions/tagged/facebook-prophet
 
 ## Installation in R
 
@@ -100,3 +99,7 @@ Make sure compilers (gcc, g++, build-essential) and Python development tools (py
 ### Version 0.1 (2017.02.23)
 
 - Initial release
+
+## License
+
+Ax is licensed under the [MIT license](LICENSE.md).
diff --git a/python/LICENSE b/python/LICENSE
index 144b986..b96dcb0 100644
--- a/python/LICENSE
+++ b/python/LICENSE
@@ -1,30 +1,21 @@
-BSD License
+MIT License
 
-For Prophet software
+Copyright (c) Facebook, Inc. and its affiliates.
 
-Copyright (c) 2017-present, Facebook, Inc. All rights reserved.
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
 
-Redistribution and use in source and binary forms, with or without modification,
-are permitted provided that the following conditions are met:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
 
- * Redistributions of source code must retain the above copyright notice, this
-   list of conditions and the following disclaimer.
-
- * Redistributions in binary form must reproduce the above copyright notice,
-   this list of conditions and the following disclaimer in the documentation
-   and/or other materials provided with the distribution.
-
- * Neither the name Facebook nor the names of its contributors may be used to
-   endorse or promote products derived from this software without specific
-   prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
-ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
-ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/python/fbprophet/diagnostics.py b/python/fbprophet/diagnostics.py
index 838f467..5f54dca 100644
--- a/python/fbprophet/diagnostics.py
+++ b/python/fbprophet/diagnostics.py
@@ -1,10 +1,8 @@
 # -*- coding: utf-8 -*-
-# Copyright (c) 2017-present, Facebook, Inc.
-# All rights reserved.
-#
-# This source code is licensed under the BSD-style license found in the
-# LICENSE file in the root directory of this source tree. An additional grant
-# of patent rights can be found in the PATENTS file in the same directory.
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 from __future__ import absolute_import, division, print_function
 
diff --git a/python/fbprophet/forecaster.py b/python/fbprophet/forecaster.py
index 6b2fcc5..73f5756 100644
--- a/python/fbprophet/forecaster.py
+++ b/python/fbprophet/forecaster.py
@@ -1,10 +1,8 @@
 # -*- coding: utf-8 -*-
-# Copyright (c) 2017-present, Facebook, Inc.
-# All rights reserved.
-#
-# This source code is licensed under the BSD-style license found in the
-# LICENSE file in the root directory of this source tree. An additional grant
-# of patent rights can be found in the PATENTS file in the same directory.
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 from __future__ import absolute_import, division, print_function
 
diff --git a/python/fbprophet/hdays.py b/python/fbprophet/hdays.py
index 047d091..2e5110d 100644
--- a/python/fbprophet/hdays.py
+++ b/python/fbprophet/hdays.py
@@ -1,10 +1,8 @@
 # -*- coding: utf-8 -*-
-# Copyright (c) 2017-present, Facebook, Inc.
-# All rights reserved.
-#
-# This source code is licensed under the BSD-style license found in the
-# LICENSE file in the root directory of this source tree. An additional grant
-# of patent rights can be found in the PATENTS file in the same directory.
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 from __future__ import absolute_import, division, print_function
 
diff --git a/python/fbprophet/make_holidays.py b/python/fbprophet/make_holidays.py
index 870feb6..c5823d8 100644
--- a/python/fbprophet/make_holidays.py
+++ b/python/fbprophet/make_holidays.py
@@ -1,10 +1,8 @@
 # -*- coding: utf-8 -*-
-# Copyright (c) 2017-present, Facebook, Inc.
-# All rights reserved.
-#
-# This source code is licensed under the BSD-style license found in the
-# LICENSE file in the root directory of this source tree. An additional grant
-# of patent rights can be found in the PATENTS file in the same directory.
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 from __future__ import absolute_import, division, print_function
 
diff --git a/python/fbprophet/models.py b/python/fbprophet/models.py
index 55dca0f..caa79f5 100644
--- a/python/fbprophet/models.py
+++ b/python/fbprophet/models.py
@@ -1,10 +1,8 @@
 # -*- coding: utf-8 -*-
-# Copyright (c) 2017-present, Facebook, Inc.
-# All rights reserved.
-#
-# This source code is licensed under the BSD-style license found in the
-# LICENSE file in the root directory of this source tree. An additional grant
-# of patent rights can be found in the PATENTS file in the same directory.
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 from __future__ import absolute_import, division, print_function
 
diff --git a/python/fbprophet/plot.py b/python/fbprophet/plot.py
index 2f6239a..a21f376 100644
--- a/python/fbprophet/plot.py
+++ b/python/fbprophet/plot.py
@@ -1,10 +1,8 @@
 # -*- coding: utf-8 -*-
-# Copyright (c) 2017-present, Facebook, Inc.
-# All rights reserved.
-#
-# This source code is licensed under the BSD-style license found in the
-# LICENSE file in the root directory of this source tree. An additional grant
-# of patent rights can be found in the PATENTS file in the same directory.
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 from __future__ import absolute_import, division, print_function
 
diff --git a/python/fbprophet/tests/test_diagnostics.py b/python/fbprophet/tests/test_diagnostics.py
index 435422f..f682b49 100644
--- a/python/fbprophet/tests/test_diagnostics.py
+++ b/python/fbprophet/tests/test_diagnostics.py
@@ -1,9 +1,7 @@
-# Copyright (c) 2017-present, Facebook, Inc.
-# All rights reserved.
-#
-# This source code is licensed under the BSD-style license found in the
-# LICENSE file in the root directory of this source tree. An additional grant
-# of patent rights can be found in the PATENTS file in the same directory.
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 from __future__ import absolute_import
 from __future__ import division
diff --git a/python/fbprophet/tests/test_prophet.py b/python/fbprophet/tests/test_prophet.py
index fac9024..6c9570c 100644
--- a/python/fbprophet/tests/test_prophet.py
+++ b/python/fbprophet/tests/test_prophet.py
@@ -1,9 +1,7 @@
-# Copyright (c) 2017-present, Facebook, Inc.
-# All rights reserved.
-#
-# This source code is licensed under the BSD-style license found in the
-# LICENSE file in the root directory of this source tree. An additional grant
-# of patent rights can be found in the PATENTS file in the same directory.
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 from __future__ import absolute_import
 from __future__ import division
diff --git a/python/scripts/generate_holidays_file.py b/python/scripts/generate_holidays_file.py
index df46824..9633dca 100644
--- a/python/scripts/generate_holidays_file.py
+++ b/python/scripts/generate_holidays_file.py
@@ -1,9 +1,7 @@
-# Copyright (c) 2017-present, Facebook, Inc.
-# All rights reserved.
-#
-# This source code is licensed under the BSD-style license found in the
-# LICENSE file in the root directory of this source tree. An additional grant
-# of patent rights can be found in the PATENTS file in the same directory.
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 from __future__ import absolute_import
 from __future__ import division
diff --git a/python/setup.py b/python/setup.py
index f56e696..fcde55a 100644
--- a/python/setup.py
+++ b/python/setup.py
@@ -1,3 +1,8 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
 import os.path
 import pickle
 import platform
@@ -102,7 +107,7 @@ setup(
     url='https://facebook.github.io/prophet/',
     author='Sean J. Taylor <sjtz@pm.me>, Ben Letham <bletham@fb.com>',
     author_email='sjtz@pm.me',
-    license='BSD',
+    license='MIT',
     packages=find_packages(),
     setup_requires=[
     ],
diff --git a/python/stan/unix/prophet.stan b/python/stan/unix/prophet.stan
index 7394840..79db33c 100644
--- a/python/stan/unix/prophet.stan
+++ b/python/stan/unix/prophet.stan
@@ -1,3 +1,8 @@
+// Copyright (c) Facebook, Inc. and its affiliates.
+
+// This source code is licensed under the MIT license found in the
+// LICENSE file in the root directory of this source tree.
+
 functions {
   matrix get_changepoint_matrix(vector t, vector t_change, int T, int S) {
     // Assumes t and t_change are sorted.
diff --git a/python/stan/win/prophet.stan b/python/stan/win/prophet.stan
index 5501ea8..ea9f5b1 100644
--- a/python/stan/win/prophet.stan
+++ b/python/stan/win/prophet.stan
@@ -1,3 +1,8 @@
+// Copyright (c) Facebook, Inc. and its affiliates.
+
+// This source code is licensed under the MIT license found in the
+// LICENSE file in the root directory of this source tree.
+
 functions {
   real[ , ] get_changepoint_matrix(real[] t, real[] t_change, int T, int S) {
     // Assumes t and t_change are sorted.