diff --git a/README.rst b/README.rst
index f908149..492cd42 100644
--- a/README.rst
+++ b/README.rst
@@ -22,6 +22,12 @@ Or pip::
 
     $ pip install aweber_api
 
+Compatibility
+=============
+The client library has been tested as compatible with python versions:
+
+* 2.6
+* 2.7
 
 Testing
 =======