diff --git a/nixos/modules/services/web-apps/nextcloud.xml b/nixos/modules/services/web-apps/nextcloud.xml
index f71c8df6c6d4..6cbfda118c4f 100644
--- a/nixos/modules/services/web-apps/nextcloud.xml
+++ b/nixos/modules/services/web-apps/nextcloud.xml
@@ -182,6 +182,17 @@
   </para>
  </section>
 
+ <section xml:id="installing-apps-php-extensions-nextcloud">
+  <title>Installing Apps and PHP extensions</title>
+
+  <para>
+   Nextcloud apps are installed statefully through the web interface.
+
+   Some apps may require extra PHP extensions to be installed.
+   This can be configured with the <xref linkend="opt-services.nextcloud.phpExtraExtensions" /> setting.
+  </para>
+ </section>
+
  <section xml:id="module-services-nextcloud-maintainer-info">
   <title>Maintainer information</title>