Add in a comment that was removed in 240adc564539 (requested by Victor Stinner)

briancurtin · briancurtin · commit a3852ff33a7b · 2013-07-22T19:05:48.000-05:00
diff --git a/Lib/posixpath.py b/Lib/posixpath.py
@@ -188,6 +188,7 @@ def ismount(path):
         # It doesn't exist -- so not a mount point. :-)
         return False
     else:
+        # A symlink can never be a mount point
         if stat.S_ISLNK(s1.st_mode):
             return False
 
