diff --git a/common/net_api.h b/common/net_api.h
index 3a8229df..410f1152 100644
--- a/common/net_api.h
+++ b/common/net_api.h
@@ -27,6 +27,7 @@
 // Set this flag for things like broadcast requests, etc. where the engine should not
 // kill the request hook after receiving the first response
 #define FNETAPI_MULTIPLE_RESPONSE		( 1<<0 )
+// 1<<1 is reserved for deprecated xash3d-fwgs extension
 
 struct net_response_s;
 typedef void (*net_api_response_func_t) ( struct net_response_s *response );