diff --git a/CHANGELOG-3.5.md b/CHANGELOG-3.5.md
index e7d68ed0f39..95f9919544e 100644
--- a/CHANGELOG-3.5.md
+++ b/CHANGELOG-3.5.md
@@ -128,6 +128,9 @@ Note that any `etcd_debugging_*` metrics are experimental and subject to change.
 - Add [reason field for /health response](https://github.com/etcd-io/etcd/pull/11983).
 - Add [`--unsafe-no-fsync`](https://github.com/etcd-io/etcd/pull/11946) flag.
   - Setting the flag disables all uses of fsync, which is unsafe and will cause data loss. This flag makes it possible to run an etcd node for testing and development without placing lots of load on the file system.
+- Add [etcd --auth-token-ttl](https://github.com/etcd-io/etcd/pull/11980) flag to customize `simpleTokenTTL` settings.
+- Improve [runtime.FDUsage objects malloc of Memory Usage and CPU Usage](https://github.com/etcd-io/etcd/pull/11986).
+- Improve [mvcc.watchResponse channel Memory Usage](https://github.com/etcd-io/etcd/pull/11987).
 
 ### Package `embed`
 
diff --git a/Documentation/op-guide/configuration.md b/Documentation/op-guide/configuration.md
index 20911e928f7..01ef434b7d1 100644
--- a/Documentation/op-guide/configuration.md
+++ b/Documentation/op-guide/configuration.md
@@ -439,6 +439,11 @@ Follow the instructions when using these flags.
 + default: 10
 + env variable: (not supported)
 
+### --auth-token-ttl
++ Time (in seconds) of the auth-token-ttl. Support `--auth-token=simple` model only.
++ default: 300
++ env variable: (not supported)
+
 ## Experimental flags
 
 ### --experimental-corrupt-check-time