diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 2cce2286bdcda987a8a95e5830e5830ff1911e0f..7dca326648d564f8974de1724505b0612557695c 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -203,7 +203,10 @@ static ctl_table root_table[] = {
 		.mode		= 0555,
 		.child		= dev_table,
 	},
-
+/*
+ * NOTE: do not add new entries to this table unless you have read
+ * Documentation/sysctl/ctl_unnumbered.txt
+ */
 	{ .ctl_name = 0 }
 };
 
@@ -992,6 +995,14 @@ static ctl_table vm_table[] = {
 		.extra1		= &zero,
 	},
 #endif
+/*
+ * NOTE: do not add new entries to this table unless you have read
+ * Documentation/sysctl/ctl_unnumbered.txt
+ */
+/*
+ * NOTE: do not add new entries to this table unless you have read
+ * Documentation/sysctl/ctl_unnumbered.txt
+ */
 	{ .ctl_name = 0 }
 };
 
@@ -1132,6 +1143,14 @@ static ctl_table fs_table[] = {
 		.child		= binfmt_misc_table,
 	},
 #endif
+/*
+ * NOTE: do not add new entries to this table unless you have read
+ * Documentation/sysctl/ctl_unnumbered.txt
+ */
+/*
+ * NOTE: do not add new entries to this table unless you have read
+ * Documentation/sysctl/ctl_unnumbered.txt
+ */
 	{ .ctl_name = 0 }
 };