diff --git a/doc/release-notes-31974.md b/doc/release-notes-31974.md
new file mode 100644
index 00000000000..8a36977a004
--- /dev/null
+++ b/doc/release-notes-31974.md
@@ -0,0 +1,13 @@
+Notable changes
+===============
+
+Testnet3 removed
+-----
+Support for Testnet4 as specified in [BIP94](https://github.com/bitcoin/bips/blob/master/bip-0094.mediawiki)
+was added in v28.0, which also deprecated Testnet3. This release removes
+Testnet3 support entirely.
+
+Testnet3 may continue to exist indefinitely. It is still supported by v29.x
+releases. It may become more difficult over time to bootstrap a new node,
+as the DNS seeds and hardcoded seed nodes may go offline. If that happens
+it may help to manually connect to a known peer using the `addnode` RPC.