diff --git a/libasn1fix/asn1fix_cws.h b/libasn1fix/asn1fix_cws.h
new file mode 100644
index 0000000..a134e53
--- /dev/null
+++ b/libasn1fix/asn1fix_cws.h
@@ -0,0 +1,24 @@
+#ifndef	_ASN1FIX_CLASS_WITH_SYNTAX_H_
+#define	_ASN1FIX_CLASS_WITH_SYNTAX_H_
+
+/*
+ * This structure describes the "WITH SYNTAX" clause of a CLASS.
+ */
+typedef struct asn1f_cws_syntax_list_s {
+	struct asn1f_cws_spec **cwspecs;
+	int cwcount;	/* Number of pieces of CWS information */
+} asn1f_cws_syntax_list_t;
+
+struct asn1f_cws_spec {
+	enum {
+		CWS_LITERAL,
+		CWS_FIELD,
+		CWS_OPTIONALGROUP
+	} type;
+	union {
+		char *token;	/* For CWSB_LITERAL & CWSB_FIELD */
+		asn1f_cws_syntax_list_t *syntax;
+	} content;
+};
+
+#endif	/* _ASN1FIX_CLASS_WITH_SYNTAX_H_ */