diff --git a/jedi/api_classes.py b/jedi/api_classes.py
index 14d00129..3c6682a1 100644
--- a/jedi/api_classes.py
+++ b/jedi/api_classes.py
@@ -1,4 +1,7 @@
-""" The classes returned by the api """
+"""`api_classes` contains the return classes of the API. These classes are the
+much bigger part of the whole API, because here you get out the information
+about completion and goto operations.
+"""
 
 import re
 import os