diff --git a/pisi-spec.rng b/pisi-spec.rng
index 75118884..a4db427a 100644
--- a/pisi-spec.rng
+++ b/pisi-spec.rng
@@ -307,6 +307,7 @@
                 <value>F-PROT</value>
                 <value>FDL-1.1</value>
                 <value>FDL-1.2</value>
+                <value>FDL-1.3</value>
                 <value>FESTIVAL</value>
                 <value>FIPL-1.0</value>
                 <value>FLEX</value>