diff --git a/refpolicy/doc/policy.dtd b/refpolicy/doc/policy.dtd
index 2e063a8..8a5e42b 100644
--- a/refpolicy/doc/policy.dtd
+++ b/refpolicy/doc/policy.dtd
@@ -10,7 +10,7 @@
       name CDATA #REQUIRED
       dftval CDATA #REQUIRED>
 <!ELEMENT summary (#PCDATA)>
-<!ELEMENT interface (summary?,description,securitydesc?,parameter+,infoflow?)>
+<!ELEMENT interface (summary?,description?,securitydesc?,parameter+,infoflow?)>
 <!ATTLIST interface name CDATA #REQUIRED>
 <!ELEMENT description (#PCDATA)>
 <!ELEMENT securitydesc (#PCDATA)>