diff --git a/IkiWiki/Plugin/bzr.pm b/IkiWiki/Plugin/bzr.pm
index 16c959069..783623dee 100644
--- a/IkiWiki/Plugin/bzr.pm
+++ b/IkiWiki/Plugin/bzr.pm
@@ -255,6 +255,10 @@ sub rcs_recentchanges ($) {
 	return @ret;
 }
 
+sub rcs_diff ($) {
+	# TODO
+}
+
 sub rcs_getctime ($) {
 	my ($file) = @_;
 
diff --git a/debian/changelog b/debian/changelog
index 1dc01878b..ac7e2f21d 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -10,6 +10,7 @@ ikiwiki (3.05) UNRELEASED; urgency=low
   * Add tagged() PageSpec.
   * Updated German translation (Kai Wasserbäch). Closes: #516770
   * Setup automator: Prompt for password twice. Closes: #516973
+  * bzr: Add missing stub rcs_diff.
 
  -- Joey Hess <joeyh@debian.org>  Sun, 15 Feb 2009 20:11:57 -0500