diff --git a/core/doc/helper.rst b/core/doc/helper.rst
index 5de671aed8587d79f96b2995becd0d05f25de59f..3af02dfc72096745f22f1d7ab323f02100942ab8 100644
--- a/core/doc/helper.rst
+++ b/core/doc/helper.rst
@@ -86,3 +86,5 @@ File Tests
 .. autofunction:: FileExists
 
 .. autofunction:: FileExtension
+
+.. autofunction:: FileGzip