diff --git a/relnotes/6.4 b/relnotes/6.4
--- a/relnotes/6.4
+++ b/relnotes/6.4
@@ -1,3 +1,16 @@
+= Mercurial 6.4.3 =
+
+ * chg: declare environ (issue6812)
+ * chg: set CHGHG before connecting to command server
+ * delta-find: never do anything fancy when general delta is off
+ * delta-find: add a simple safeguard to prevent bad non-general-delta
+ * debug-delta: add minimal documentation for `devel.bundle-delta` option
+ * fix: highlight the required configuration and behavior of the fixer tools
+ * rhg: don't print copy source when --no-status is passed
+ * rhg: correctly relativize copy source path
+ * repo-upgrade: write new requirement before upgrading the dirstate
+ * backup: fix issue when the backup end up in a different directory
+
 = Mercurial 6.4.2 =
 
 Exceptional bugfix release due to a corruption bug that happens when using