diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -3069,7 +3069,7 @@
         #          |
         # old      o - changeset to amend
         #          |
-        # base     o - parent of amending changeset
+        # base     o - first parent of the changeset to amend
 
         # Update extra dict from amended commit (e.g. to preserve graft
         # source)