diff --git a/libasn1fix/asn1fix_cws.h b/libasn1fix/asn1fix_cws.h
index 75f7830..25fd208 100644
--- a/libasn1fix/asn1fix_cws.h
+++ b/libasn1fix/asn1fix_cws.h
@@ -1,4 +1,10 @@
 #ifndef	_ASN1FIX_CLASS_WITH_SYNTAX_H_
 #define	_ASN1FIX_CLASS_WITH_SYNTAX_H_
 
+/*
+ * CLASS may contain the "WITH SYNTAX" clause, in which case we are
+ * going to parse it.
+ */
+int asn1f_parse_class_with_syntax(arg_t *arg);
+
 #endif	/* _ASN1FIX_CLASS_WITH_SYNTAX_H_ */