diff --git a/pisi-spec.rng b/pisi-spec.rng
index fd3665fa..4aaacb65 100644
--- a/pisi-spec.rng
+++ b/pisi-spec.rng
@@ -6,9 +6,7 @@
 
     <!-- Start Document -->
     <start>
-        <choice>
-            <ref name="PISI"/>
-        </choice>
+        <ref name="PISI"/>
     </start>
 
     <!-- PISI Section -->