diff --git a/changelog.d/3734.misc b/changelog.d/3734.misc
new file mode 100644
index 0000000000000000000000000000000000000000..4f6e4b384808cbeb43693b75a92f27493a8a9821
--- /dev/null
+++ b/changelog.d/3734.misc
@@ -0,0 +1 @@
+Reference the need for an HTTP replication port when using the federation_reader worker
diff --git a/docs/workers.rst b/docs/workers.rst
index 81146a211f20ec69de19bbe591d7be7883630e47..101e95002094ec44f2762d0d45c45638f537df83 100644
--- a/docs/workers.rst
+++ b/docs/workers.rst
@@ -74,7 +74,7 @@ replication endpoints that it's talking to on the main synapse process.
 ``worker_replication_port`` should point to the TCP replication listener port and
 ``worker_replication_http_port`` should point to the HTTP replication port.
 
-Currently, only the ``event_creator`` worker requires specifying
+Currently, the ``event_creator`` and ``federation_reader`` workers require specifying
 ``worker_replication_http_port``.
 
 For instance::