diff --git a/README.rst b/README.rst
index eca8a32..accd17b 100644
--- a/README.rst
+++ b/README.rst
@@ -12,7 +12,7 @@ Installation
 ============
     ``$ python3 -m pip install ideam``
 
-**NOTE**: Python2 is not supported.
+**NOTE**: Python2 is not supported. `ideam` requires Python '>=3.5.4'
 
 Getting started
 ===============