diff --git a/book/changelog.md b/book/changelog.md
index a8951562..5b2da825 100644
--- a/book/changelog.md
+++ b/book/changelog.md
@@ -272,3 +272,6 @@ This will be the first release of Grapevine since it was forked from Conduit
 23. Added support for HAProxy [proxy protocol](http://www.haproxy.org/download/3.0/doc/proxy-protocol.txt)
     listeners.
     ([!97](https://gitlab.computer.surgery/matrix/grapevine-fork/-/merge_requests/97))
+24. Add a `check-config` CLI subcommand to check whether the configuration file
+    is valid.
+    ([!121](https://gitlab.computer.surgery/matrix/grapevine/-/merge_requests/121))