diff --git a/modules/programs/termite.nix b/modules/programs/termite.nix
index ce047b8f..7e3288bb 100644
--- a/modules/programs/termite.nix
+++ b/modules/programs/termite.nix
@@ -150,7 +150,11 @@ in
         type = types.nullOr types.bool;
         description = ''
           Emit escape sequences for extra keys,
-          like the modifyOtherKeys resource for xterm(1).
+          like the modifyOtherKeys resource for
+          <citerefentry>
+            <refentrytitle>xterm</refentrytitle>
+            <manvolnum>1</manvolnum>
+          </citerefentry>.
         '';
       };