diff --git a/README.md b/README.md
index df16898..be7cf74 100644
--- a/README.md
+++ b/README.md
@@ -72,7 +72,7 @@ Documentation: https://stable-baselines3.readthedocs.io/en/master/guide/rl_zoo.h
 
 We implement experimental features in a separate contrib repository: [SB3-Contrib](https://github.com/Stable-Baselines-Team/stable-baselines3-contrib)
 
-This allows SB3 to maintain a stable and compact core, while still providing the latest features, like Truncated Quantile Critics (TQC) or Quantile Regression DQN (QR-DQN).
+This allows SB3 to maintain a stable and compact core, while still providing the latest features, like Truncated Quantile Critics (TQC), Quantile Regression DQN (QR-DQN) or PPO with invalid action masking (Maskable PPO).
 
 Documentation is available online: [https://sb3-contrib.readthedocs.io/](https://sb3-contrib.readthedocs.io/)
 
@@ -167,7 +167,11 @@ All the following examples can be executed online using Google colab notebooks:
 | PPO   | :x: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark:  | :heavy_check_mark: | :heavy_check_mark:                |
 | SAC   | :x: | :heavy_check_mark: | :x:                | :x:                 | :x:                | :x:                               |
 | TD3   | :x: | :heavy_check_mark: | :x:                | :x:                 | :x:                | :x:                               |
+| QR-DQN<sup>[1](#f1)</sup>  | :x: | :x: | :heavy_check_mark: | :x:                 | :x:                | :x:                               |
+| TQC<sup>[1](#f1)</sup>   | :x: | :heavy_check_mark: | :x:                | :x:                 | :x:                | :x:                               |
+| Maskable PPO<sup>[1](#f1)</sup>   | :x: | :x: | :heavy_check_mark: | :heavy_check_mark:  | :heavy_check_mark: | :heavy_check_mark:  |
 
+<b id="f1">1</b>: Implemented in [SB3 Contrib](https://github.com/Stable-Baselines-Team/stable-baselines3-contrib) GitHub repository.
 
 Actions `gym.spaces`:
  * `Box`: A N-dimensional box that containes every point in the action space.
diff --git a/docs/guide/algos.rst b/docs/guide/algos.rst
index 78ccb9a..c9201e7 100644
--- a/docs/guide/algos.rst
+++ b/docs/guide/algos.rst
@@ -5,19 +5,24 @@ This table displays the rl algorithms that are implemented in the Stable Baselin
 along with some useful characteristics: support for discrete/continuous actions, multiprocessing.
 
 
-============ =========== ============ ================= =============== ================
-Name         ``Box``     ``Discrete`` ``MultiDiscrete`` ``MultiBinary`` Multi Processing
-============ =========== ============ ================= =============== ================
-A2C          ✔️           ✔️            ✔️                 ✔️               ✔️
-DDPG         ✔️          ❌            ❌                ❌              ❌
-DQN          ❌           ✔️           ❌                ❌              ❌
-HER          ✔️            ✔️           ❌                ❌              ❌
-PPO          ✔️           ✔️            ✔️                 ✔️               ✔️
-SAC          ✔️          ❌            ❌                ❌              ❌
-TD3          ✔️          ❌            ❌                ❌              ❌
-============ =========== ============ ================= =============== ================
+===================  =========== ============ ================= =============== ================
+Name                 ``Box``     ``Discrete`` ``MultiDiscrete`` ``MultiBinary`` Multi Processing
+===================  =========== ============ ================= =============== ================
+A2C                  ✔️           ✔️            ✔️                 ✔️               ✔️
+DDPG                 ✔️           ❌            ❌                ❌              ❌
+DQN                  ❌           ✔️            ❌                ❌              ❌
+HER                  ✔️           ✔️            ❌                ❌              ❌
+PPO                  ✔️           ✔️            ✔️                 ✔️               ✔️
+SAC                  ✔️           ❌            ❌                ❌              ❌
+TD3                  ✔️           ❌            ❌                ❌              ❌
+QR-DQN [#f1]_        ❌          ️ ✔️            ❌                ❌              ❌
+TQC [#f1]_           ✔️           ❌            ❌                ❌              ❌
+Maskable PPO [#f1]_  ❌           ✔️            ✔️                 ✔️               ✔️
+===================  =========== ============ ================= =============== ================
 
 
+.. [#f1] Implemented in `SB3 Contrib <https://github.com/Stable-Baselines-Team/stable-baselines3-contrib>`_
+
 .. note::
   ``Tuple`` observation spaces are not supported by any environment
   however single-level ``Dict`` spaces are (cf. :ref:`Examples <examples>`).
diff --git a/docs/guide/sb3_contrib.rst b/docs/guide/sb3_contrib.rst
index 3d2d15e..3057564 100644
--- a/docs/guide/sb3_contrib.rst
+++ b/docs/guide/sb3_contrib.rst
@@ -38,6 +38,7 @@ See documentation for the full list of included features.
 
 - `Truncated Quantile Critics (TQC)`_
 - `Quantile Regression DQN (QR-DQN)`_
+- `PPO with invalid action masking (Maskable PPO) <https://arxiv.org/abs/2006.14171>`_
 
 **Gym Wrappers**:
 
diff --git a/docs/misc/changelog.rst b/docs/misc/changelog.rst
index 70eff4c..211ebe0 100644
--- a/docs/misc/changelog.rst
+++ b/docs/misc/changelog.rst
@@ -44,6 +44,7 @@ Documentation:
 - Update read the doc env (fixed ``docutils`` issue)
 - Fix PPO environment name (@IljaAvadiev)
 - Fix custom env doc and add env registration example
+- Update algorithms from SB3 Contrib
 
 
 Release 1.2.0 (2021-09-03)