diff -r c90014d5cdc3 -r 169baf3d1d3c mercurial/copies.py
--- a/mercurial/copies.py	Tue Aug 22 11:00:46 2017 -0400
+++ b/mercurial/copies.py	Tue Aug 22 16:08:31 2017 +0200
@@ -637,8 +637,8 @@
     limit = the rev number to not search beyond
     data = dictionary of dictionary to store copy data. (see mergecopies)
 
-    note: limit is only an optimization, and there is no guarantee that
-    irrelevant revisions will not be limited
+    note: limit is only an optimization, and provides no guarantee that
+    irrelevant revisions will not be visited
     there is no easy way to make this algorithm stop in a guaranteed way
     once it "goes behind a certain revision".
     """