diff -r 92a6b16c9186 -r 1ab30e9ba0fc mercurial/hg.py
--- a/mercurial/hg.py	Fri May 09 16:13:14 2014 -0700
+++ b/mercurial/hg.py	Fri May 09 18:09:11 2014 -0700
@@ -483,7 +483,8 @@
     When overwrite is set, changes are clobbered, merged else
 
     returns stats (see pydoc mercurial.merge.applyupdates)"""
-    return mergemod.update(repo, node, False, overwrite, None)
+    return mergemod.update(repo, node, False, overwrite, None,
+                           labels=['working copy', 'destination'])
 
 def update(repo, node):
     """update the working directory to node, merging linear changes"""