# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@ens-lyon.org>
# Date 1490350842 -3600
# Node ID 16a5a37ced62d540b1c99f8581c9040bcb5b413c
# Parent  e922cd76804a6595e09d38c160743b4ac7858c36
stablerange: add some basic documentation about the cache

diff --git a/hgext3rd/evolve/stablerange.py b/hgext3rd/evolve/stablerange.py
--- a/hgext3rd/evolve/stablerange.py
+++ b/hgext3rd/evolve/stablerange.py
@@ -225,9 +225,10 @@
 class stablerange(object):
 
     def __init__(self):
+        # cache the 'depth' of a changeset, the size of '::rev'
         self._depthcache = {}
+        # cache the standard stable subranges or a range
         self._subrangescache = {}
-
         # To slices merge, we need to walk their descendant in reverse stable
         # sort order. For now we perform a full stable sort their descendant
         # and then use the relevant top most part. This order is going to be