diff --git a/api/superfemto.h b/api/superfemto.h
index 51e2e21..f9d6fa0 100644
--- a/api/superfemto.h
+++ b/api/superfemto.h
@@ -1,5 +1,9 @@
 #ifndef SUPERFEMTO_H__
 #define SUPERFEMTO_H__
+
+#define SUPEEFEMTO_API(x,y,z)	((x << 16) | (y << 8) | z)
+#define SUPERFEMTO_API_VERSION	SUPERFEMTO_API(2,4,0)
+
 
 #ifdef __cplusplus
     extern "C" {