diff --git a/docs/source/installation.rst b/docs/source/installation.rst
index a5a3ac0b0..847c2f358 100644
--- a/docs/source/installation.rst
+++ b/docs/source/installation.rst
@@ -6,7 +6,7 @@ Prerequisites
 ---------------
 MONAI Label supports both **Ubuntu** and **Windows** OS with GPU/CUDA enabled.
 
-Make sure you have python 3.x version environment with PyTorch and CUDA installed.
+Make sure you have python 3.7/3.8/3.9 version environment with PyTorch and CUDA installed.  MONAI Label features on other python version are not verified.
 
 - Install `Python <https://www.python.org/downloads/>`_
 - Install the following Python libraries