diff -r 6368c51cfad6 -r d5ac3bebaf2a mercurial/util.py
--- a/mercurial/util.py	Thu Jun 25 22:20:09 2015 -0700
+++ b/mercurial/util.py	Sat Jun 27 11:51:25 2015 -0700
@@ -327,7 +327,6 @@
         if not data:
             self._eof = True
         else:
-            # inefficient add
             self._buffer.append(data)
 
 def popen2(cmd, env=None, newlines=False):