diff --git a/options.xhtml b/options.xhtml
index 7b5e6ced3..1a3cf9e46 100644
--- a/options.xhtml
+++ b/options.xhtml
@@ -78263,7 +78263,7 @@ boolean</p>
 </dt>
 <dd>
 <p>The interval at which the Home Manager auto expire is run.</p><p>This value is passed to the systemd timer configuration
-as the <code class="literal">OnCalendar</code> option.</p><p>The format is described in <a class="link" href="https://www.freedesktop.org/software/systemd/man/systemd.time.html" target="_top"><span class="citerefentry"><span class="refentrytitle">systemd.time</span>(7)</span></a>.</p>
+as the <code class="literal">OnCalendar</code> option.</p><p>The format is described in <a class="link" href="https://www.freedesktop.org/software/systemd/man/systemd.time.html" target="_top"><span class="citerefentry"><span class="refentrytitle">systemd.time</span>(7)</span></a>.</p><p>On Darwin it must be one of: hourly, daily, weekly, monthly, semiannually, annually, which are implemented as defined in <a class="link" href="https://www.freedesktop.org/software/systemd/man/systemd.time.html" target="_top"><span class="citerefentry"><span class="refentrytitle">systemd.time</span>(7)</span></a>.</p>
 
 <p><span class="emphasis"><em>Type:</em></span>
 string</p>