--- a/mercurial/dispatch.py	Thu Jun 25 17:45:49 2015 -0500
+++ b/mercurial/dispatch.py	Thu Jun 25 17:46:29 2015 -0500
@@ -938,6 +938,7 @@
         raise util.Abort(_(
             'flamegraph not available - install from '
             'https://github.com/evanhempel/python-flamegraph'))
+    # developer config: profiling.freq
     freq = ui.configint('profiling', 'freq', default=1000)
     filter_ = None
     collapse_recursion = True