--- a/contrib/perf.py	Tue Oct 08 02:12:15 2019 -0400
+++ b/contrib/perf.py	Tue Oct 08 01:49:34 2019 -0400
@@ -1185,6 +1185,8 @@
 
 @command(b'perfdirstatewrite', formatteropts)
 def perfdirstatewrite(ui, repo, **opts):
+    """benchmap the time it take to write a dirstate on disk
+    """
     opts = _byteskwargs(opts)
     timer, fm = gettimer(ui, opts)
     ds = repo.dirstate