diff -r 9ee4e988e2be -r f7b61ad3c64a mercurial/interfaces/repository.py
--- a/mercurial/interfaces/repository.py	Wed Jan 27 00:55:20 2021 +0100
+++ b/mercurial/interfaces/repository.py	Wed Jan 27 01:43:17 2021 +0100
@@ -734,7 +734,7 @@
         flags=0,
         cachedelta=None,
     ):
-        """Add a new revision to the store.
+        """Add a new revision to the store and return its number.
 
         This is similar to ``add()`` except it operates at a lower level.