diff --git a/libc/kernel/common/linux/mca.h b/libc/kernel/common/linux/mca.h
index dfbfc2a..488603f 100644
--- a/libc/kernel/common/linux/mca.h
+++ b/libc/kernel/common/linux/mca.h
@@ -7,68 +7,73 @@
  ***   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_MCA_H
 #define _LINUX_MCA_H
-
 #include <linux/device.h>
-
 #define MCA_bus 0
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 typedef int (*MCA_ProcFn)(char* buf, int slot, void* dev);
-
 enum MCA_AdapterStatus {
  MCA_ADAPTER_NORMAL = 0,
  MCA_ADAPTER_NONE = 1,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  MCA_ADAPTER_DISABLED = 2,
  MCA_ADAPTER_ERROR = 3
 };
-
 struct mca_device {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  u64 dma_mask;
  int pos_id;
  int slot;
-
  int index;
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int driver_loaded;
-
  unsigned char pos[8];
-
  short pos_register;
-
  enum MCA_AdapterStatus status;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  struct device dev;
  char name[32];
 };
 #define to_mca_device(mdev) container_of(mdev, struct mca_device, dev)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct mca_bus_accessor_functions {
  unsigned char (*mca_read_pos)(struct mca_device *, int reg);
  void (*mca_write_pos)(struct mca_device *, int reg,
  unsigned char byte);
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int (*mca_transform_irq)(struct mca_device *, int irq);
  int (*mca_transform_ioport)(struct mca_device *,
  int region);
  void * (*mca_transform_memory)(struct mca_device *,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  void *memory);
 };
-
 struct mca_bus {
  u64 default_dma_mask;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int number;
  struct mca_bus_accessor_functions f;
  struct device dev;
  char name[32];
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
 #define to_mca_bus(mdev) container_of(mdev, struct mca_bus, dev)
-
 struct mca_driver {
  const short *id_table;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  void *driver_data;
  struct device_driver driver;
 };
 #define to_mca_driver(mdriver) container_of(mdriver, struct mca_driver, driver)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif