diff --git a/src/main/resources/com/solab/iso8583/parse/j8583.dtd b/src/main/resources/com/solab/iso8583/parse/j8583.dtd
index aadb46e..90d53cf 100644
--- a/src/main/resources/com/solab/iso8583/parse/j8583.dtd
+++ b/src/main/resources/com/solab/iso8583/parse/j8583.dtd
@@ -6,6 +6,7 @@
 
 <!ELEMENT template ( field* ) >
 <!ATTLIST template type NMTOKEN #REQUIRED >
+<!ATTLIST template extends NMTOKEN #IMPLIED >
 
 <!ELEMENT parse ( field+ ) >
 <!ATTLIST parse type NMTOKEN #REQUIRED >