diff --git a/CHANGELOG-3.4.md b/CHANGELOG-3.4.md
index 29f1029d1..c76176ae0 100644
--- a/CHANGELOG-3.4.md
+++ b/CHANGELOG-3.4.md
@@ -7,6 +7,15 @@ The minimum recommended etcd versions to run in **production** are 3.2.28+, 3.3.
 
 <hr>
 
+## v3.4.16 (TBD 2021)
+
+### etcd server
+- Add [`--experimental-warning-apply-duration`](https://github.com/etcd-io/etcd/pull/12448) flag which allows apply duration threshold to be configurable.
+
+
+<hr>
+
+
 ## [v3.4.15](https://github.com/etcd-io/etcd/releases/tag/v3.4.15) (2021-02-26)
 
 See [code changes](https://github.com/etcd-io/etcd/compare/v3.4.14...v3.4.15) and [v3.4 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_4/) for any breaking changes.
diff --git a/CHANGELOG-3.5.md b/CHANGELOG-3.5.md
index a6a63b956..918079652 100644
--- a/CHANGELOG-3.5.md
+++ b/CHANGELOG-3.5.md
@@ -148,6 +148,7 @@ Note that any `etcd_debugging_*` metrics are experimental and subject to change.
 - [Fix server panic](https://github.com/etcd-io/etcd/pull/12288) when force-new-cluster flag is enabled in a cluster which had learner node.
 - Add [`--self-signed-cert-validity`](https://github.com/etcd-io/etcd/pull/12429) flag to support setting certificate expiration time.
   - Notice, certificates generated by etcd are valid for 1 year by default when specifying the auto-tls or peer-auto-tls option.
+- Add [`--experimental-warning-apply-duration`](https://github.com/etcd-io/etcd/pull/12448) flag which allows apply duration threshold to be configurable.
 
 ### Package `runtime`