diff --git a/hgext/git/dirstate.py b/hgext/git/dirstate.py
--- a/hgext/git/dirstate.py
+++ b/hgext/git/dirstate.py
@@ -72,6 +72,7 @@
         self._ui = ui
         self._root = os.path.dirname(root)
         self.git = gitrepo
+        self._plchangecallbacks = {}
 
     def p1(self):
         return self.git.head.peel().id.raw
@@ -202,6 +203,7 @@
         return False
 
     def write(self, tr):
+        # TODO: call parent change callbacks
 
         if tr:
 
@@ -285,6 +287,10 @@
         # TODO: track this maybe?
         yield
 
+    def addparentchangecallback(self, category, callback):
+        # TODO: should this be added to the dirstate interface?
+        self._plchangecallbacks[category] = callback
+
     def clearbackup(self, tr, backupname):
         # TODO
         pass