diff --git a/changes/ticket40444 b/changes/ticket40444
new file mode 100644
index 0000000000..62aa281889
--- /dev/null
+++ b/changes/ticket40444
@@ -0,0 +1,5 @@
+  o Major features (relay, client, onion services):
+    - Implement RTT-based congestion control for exits and onion services,
+      from Proposal 324. Disabled by default. Enabled by the 'cc_alg'
+      consensus parameter. Closes ticket 40444.
+