diff --git a/include/netlink/idiag/msg.h b/include/netlink/idiag/msg.h
index 4aae606..01e30db 100644
--- a/include/netlink/idiag/msg.h
+++ b/include/netlink/idiag/msg.h
@@ -19,6 +19,8 @@ extern "C" {
 #endif /* __cplusplus */
 
 struct idiagnl_msg;
+
+/* @deprecated: DO NOT USE this variable. */
 extern struct nl_object_ops  idiagnl_msg_obj_ops;
 
 extern struct idiagnl_msg * idiagnl_msg_alloc(void);