diff --git a/docs/roundcube.nix b/docs/roundcube.nix
index 5ec7efb..4666f1f 100644
--- a/docs/roundcube.nix
+++ b/docs/roundcube.nix
@@ -10,10 +10,15 @@
     hostName = "webmail.example.com"; # the nginx vhost
     package = pkgs.roundcube.withPlugins (
       plugins: with plugins; [
+        # external plugins to be included
         # https://search.nixos.org/packages?query=roundcubePlugins
         persistent_login
       ]
     );
+    # activate plugins
+    plugins = [
+      "persistent_login"
+    ];
     dicts = with pkgs.aspellDicts; [
       # https://search.nixos.org/packages?query=aspellDicts
       en