diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 89faebf..bf4ae4e 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -440,8 +440,8 @@
 
 enum {
 	NET_IPV4_ROUTE_FLUSH=1,
-	NET_IPV4_ROUTE_MIN_DELAY=2,
-	NET_IPV4_ROUTE_MAX_DELAY=3,
+	NET_IPV4_ROUTE_MIN_DELAY=2, /* obsolete since 2.6.25 */
+	NET_IPV4_ROUTE_MAX_DELAY=3, /* obsolete since 2.6.25 */
 	NET_IPV4_ROUTE_GC_THRESH=4,
 	NET_IPV4_ROUTE_MAX_SIZE=5,
 	NET_IPV4_ROUTE_GC_MIN_INTERVAL=6,