diff -r 5fe58f9332a4 -r 003730ca254d hgext/largefiles/basestore.py
--- a/hgext/largefiles/basestore.py	Fri Feb 08 07:09:48 2013 -0600
+++ b/hgext/largefiles/basestore.py	Fri Feb 08 13:00:08 2013 +0100
@@ -43,7 +43,8 @@
         raise NotImplementedError('abstract method')
 
     def exists(self, hashes):
-        '''Check to see if the store contains the given hashes.'''
+        '''Check to see if the store contains the given hashes. Given an
+        iterable of hashes it returns a mapping from hash to bool.'''
         raise NotImplementedError('abstract method')
 
     def get(self, files):