diff --git a/docs/Users_Guide/index.rst b/docs/Users_Guide/index.rst
index 4c723235..689b157f 100644
--- a/docs/Users_Guide/index.rst
+++ b/docs/Users_Guide/index.rst
@@ -65,6 +65,7 @@ National Center for Atmospheric Research (NCAR) is sponsored by NSF.
    installation
    vertical_interpolation
    difficulty_index
+   aggregation
    release-notes
 
 **Indices and tables**