--- a/mercurial/copies.py	Sat Oct 08 18:38:42 2016 +0200
+++ b/mercurial/copies.py	Sat Oct 08 19:03:16 2016 +0200
@@ -459,7 +459,7 @@
     check possible copies of f from m1 to m2
 
     ctx = starting context for f in m1
-    f = the filename to check
+    f = the filename to check (as in m1)
     m1 = the source manifest
     m2 = the destination manifest
     base = the changectx used as a merge base