diff --git a/pisi-spec.rng b/pisi-spec.rng
index 7a662090..46de3037 100644
--- a/pisi-spec.rng
+++ b/pisi-spec.rng
@@ -988,6 +988,7 @@
                 <value>xhost</value>
                 <value>xineramaproto</value>
                 <value>xinit</value>
+                <value>xiph</value>
                 <value>xkbcomp</value>
                 <value>xkbdata</value>
                 <value>xkbevd</value>