diff --git a/mercurial/metadata.py b/mercurial/metadata.py
--- a/mercurial/metadata.py
+++ b/mercurial/metadata.py
@@ -23,7 +23,7 @@
 
 
 class ChangingFiles(object):
-    """A class recording the changes made to a file by a changeset
+    """A class recording the changes made to files by a changeset
 
     Actions performed on files are gathered into 3 sets: