diff -r 5418dd5be8ac -r 578fc97904da mercurial/changegroup.py
--- a/mercurial/changegroup.py	Thu Jun 25 17:43:24 2015 -0500
+++ b/mercurial/changegroup.py	Thu Jun 25 17:43:52 2015 -0500
@@ -283,6 +283,7 @@
         if bundlecaps is None:
             bundlecaps = set()
         self._bundlecaps = bundlecaps
+        # experimental config: bundle.reorder
         reorder = repo.ui.config('bundle', 'reorder', 'auto')
         if reorder == 'auto':
             reorder = None