diff --git a/docs/differences/index_template.txt b/docs/differences/index_template.txt
index eb8b3ba640..41ddeb6d3e 100644
--- a/docs/differences/index_template.txt
+++ b/docs/differences/index_template.txt
@@ -4,6 +4,7 @@ MicroPython differences from CPython
 ====================================
 
 The operations listed in this section produce conflicting results in MicroPython when compared to standard Python.
+MicroPython implements Python 3.4 and some select features of Python 3.5.
 
 .. toctree::
     :maxdepth: 2