diff --git a/libc/kernel/common/linux/rbtree.h b/libc/kernel/common/linux/rbtree.h
index 714ffe9..ac4b5a5 100644
--- a/libc/kernel/common/linux/rbtree.h
+++ b/libc/kernel/common/linux/rbtree.h
@@ -7,39 +7,47 @@
  ***   structures, and macros generated from the original header, and thus,
  ***   contains no copyrightable information.
  ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
  ****************************************************************************
  ****************************************************************************/
 #ifndef _LINUX_RBTREE_H
 #define _LINUX_RBTREE_H
-
 #include <linux/kernel.h>
 #include <linux/stddef.h>
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct rb_node
 {
  unsigned long rb_parent_color;
 #define RB_RED 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define RB_BLACK 1
  struct rb_node *rb_right;
  struct rb_node *rb_left;
 } __attribute__((aligned(sizeof(long))));
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct rb_root
 {
  struct rb_node *rb_node;
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define rb_parent(r) ((struct rb_node *)((r)->rb_parent_color & ~3))
 #define rb_color(r) ((r)->rb_parent_color & 1)
 #define rb_is_red(r) (!rb_color(r))
 #define rb_is_black(r) rb_color(r)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define rb_set_red(r) do { (r)->rb_parent_color &= ~1; } while (0)
 #define rb_set_black(r) do { (r)->rb_parent_color |= 1; } while (0)
-
 #define RB_ROOT (struct rb_root) { NULL, }
 #define rb_entry(ptr, type, member) container_of(ptr, type, member)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define RB_EMPTY_ROOT(root) ((root)->rb_node == NULL)
 #define RB_EMPTY_NODE(node) (rb_parent(node) != node)
 #define RB_CLEAR_NODE(node) (rb_set_parent(node, node))
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */