diff --git a/docs/source/config_file.rst b/docs/source/config_file.rst
index 9998a15467c4..1241c40e5ac8 100644
--- a/docs/source/config_file.rst
+++ b/docs/source/config_file.rst
@@ -323,7 +323,7 @@ Platform configuration
     :type: string
 
     Specifies the Python version used to parse and check the target
-    program.  The string should be in the format ``DIGIT.DIGIT`` --
+    program.  The string should be in the format ``MAJOR.MINOR`` --
     for example ``2.7``.  The default is the version of the Python
     interpreter used to run mypy.