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+++ b/develop/usage/configuration/config_documentation.html
@@ -1163,6 +1163,10 @@ N.B. we recommend also firewalling your federation listener to limit
inbound federation traffic as early as possible, rather than relying
purely on this application-layer restriction. If not specified, the
default is to whitelist everything.</p>
+<p>Note: this does not stop a server from joining rooms that servers not on the
+whitelist are in. As such, this option is really only useful to establish a
+"private federation", where a group of servers all whitelist each other and have
+the same whitelist.</p>
<p>Example configuration:</p>
<pre><code class="language-yaml">federation_domain_whitelist:
- lon.example.com
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