diff --git a/pisi-spec.rng b/pisi-spec.rng
index 54df5ded..f480bc65 100644
--- a/pisi-spec.rng
+++ b/pisi-spec.rng
@@ -304,6 +304,7 @@
                 <value>IBM-J1.5</value>
                 <value>IBM-J1.6</value>
                 <value>ICE</value>
+                <value>IDPL-1</value>
                 <value>IPL-1</value>
                 <value>IRPDL</value>
                 <value>ISC</value>