diff --git a/doc/api.rst b/doc/api.rst
index dfe05ade0..331d08868 100644
--- a/doc/api.rst
+++ b/doc/api.rst
@@ -300,6 +300,8 @@ Utility methods
 .. automodule:: message_ix.util
    :members: expand_dims, copy_model, make_df
 
+.. automodule:: message_ix.util.Sankey
+   :members: map_for_sankey
 
 Testing utilities
 -----------------
diff --git a/doc/reporting.rst b/doc/reporting.rst
index b6ea7516f..540f20952 100644
--- a/doc/reporting.rst
+++ b/doc/reporting.rst
@@ -215,6 +215,7 @@ These automatic contents are prepared using:
    .. autosummary::
       add
       add_queue
+      add_sankey
       add_single
       apply
       check_keys