diff --git a/include/apimagic/apimagic.h b/include/apimagic/apimagic.h
index 23e8a48..8ea0b36 100644
--- a/include/apimagic/apimagic.h
+++ b/include/apimagic/apimagic.h
@@ -71,6 +71,7 @@ struct amgc_action {
 	int				action;
 	const char *			symbol;
 	const char *			filter;
+	int				subset;
 };
 
 struct amgc_common_ctx {