diff --git a/README.md b/README.md
index d641b94..56bf9e5 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,12 @@ Prophet is a [CRAN package](https://cran.r-project.org/package=prophet) so you c
 > install.packages('prophet')
 ```
 
+On Mac OS X, the binaries on CRAN are still being updated, so use
+```
+# R
+> install.packages('prophet', type='source')
+```
+
 After installation, you can [get started!](https://facebook.github.io/prophet/docs/quick_start.html#r-api)
 
 ### Windows
diff --git a/docs/_docs/installation.md b/docs/_docs/installation.md
index 7bd8634..b04f684 100644
--- a/docs/_docs/installation.md
+++ b/docs/_docs/installation.md
@@ -16,6 +16,12 @@ Prophet is a [CRAN package](https://cran.r-project.org/package=prophet) so you c
 > install.packages('prophet')
 ```
 
+On Mac OS X, the binaries on CRAN are still being updated, so use
+```
+# R
+> install.packages('prophet', type='source')
+```
+
 After installation, you can [get started!](quick_start.html#r-api)
 
 ### Windows