diff --git a/tutorials/legacy/net/udpserver.c b/tutorials/legacy/net/udpserver.c
index a74f6f0a85f1a..b7df9db119455 100644
--- a/tutorials/legacy/net/udpserver.c
+++ b/tutorials/legacy/net/udpserver.c
@@ -1,3 +1,6 @@
+/// \file udpserver.c
+/// \ingroup tutorial_net
+
 /* fpont 12/99 */
 /* pont.net    */
 /* udpserver.c */