diff --git a/libc/kernel/common/linux/i2c.h b/libc/kernel/common/linux/i2c.h
index 9513fc6..f266a97 100644
--- a/libc/kernel/common/linux/i2c.h
+++ b/libc/kernel/common/linux/i2c.h
@@ -7,89 +7,95 @@
  ***   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_I2C_H
 #define _LINUX_I2C_H
-
 #include <linux/types.h>
-
 struct i2c_msg {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u16 addr;
  __u16 flags;
 #define I2C_M_TEN 0x10  
 #define I2C_M_RD 0x01
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define I2C_M_NOSTART 0x4000
 #define I2C_M_REV_DIR_ADDR 0x2000
 #define I2C_M_IGNORE_NAK 0x1000
 #define I2C_M_NO_RD_ACK 0x0800
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u16 len;
  __u8 *buf;
 };
-
 #define I2C_FUNC_I2C 0x00000001
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define I2C_FUNC_10BIT_ADDR 0x00000002
 #define I2C_FUNC_PROTOCOL_MANGLING 0x00000004  
 #define I2C_FUNC_SMBUS_HWPEC_CALC 0x00000008  
 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define I2C_FUNC_SMBUS_QUICK 0x00010000 
 #define I2C_FUNC_SMBUS_READ_BYTE 0x00020000 
 #define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000 
 #define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000 
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000 
 #define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000 
 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000 
 #define I2C_FUNC_SMBUS_PROC_CALL 0x00800000 
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000 
 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 
 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000  
 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 0x10000000  
 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2 0x20000000  
-
 #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE |   I2C_FUNC_SMBUS_WRITE_BYTE)
 #define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA |   I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA |   I2C_FUNC_SMBUS_WRITE_WORD_DATA)
 #define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA |   I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
 #define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK |   I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
 #define I2C_FUNC_SMBUS_I2C_BLOCK_2 (I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 |   I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK |   I2C_FUNC_SMBUS_BYTE |   I2C_FUNC_SMBUS_BYTE_DATA |   I2C_FUNC_SMBUS_WORD_DATA |   I2C_FUNC_SMBUS_PROC_CALL |   I2C_FUNC_SMBUS_WRITE_BLOCK_DATA |   I2C_FUNC_SMBUS_I2C_BLOCK)
-
 #define I2C_SMBUS_BLOCK_MAX 32   
 union i2c_smbus_data {
  __u8 byte;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u16 word;
  __u8 block[I2C_SMBUS_BLOCK_MAX + 2];
-
 };
-
 #define I2C_SMBUS_READ 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define I2C_SMBUS_WRITE 0
-
 #define I2C_SMBUS_QUICK 0
 #define I2C_SMBUS_BYTE 1
 #define I2C_SMBUS_BYTE_DATA 2 
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define I2C_SMBUS_WORD_DATA 3
 #define I2C_SMBUS_PROC_CALL 4
 #define I2C_SMBUS_BLOCK_DATA 5
 #define I2C_SMBUS_I2C_BLOCK_DATA 6
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define I2C_SMBUS_BLOCK_PROC_CALL 7  
-
 #define I2C_RETRIES 0x0701  
-
 #define I2C_TIMEOUT 0x0702  
-
 #define I2C_SLAVE 0x0703  
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define I2C_SLAVE_FORCE 0x0706  
-
 #define I2C_TENBIT 0x0704  
-
 #define I2C_FUNCS 0x0705  
 #define I2C_RDWR 0x0707  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define I2C_PEC 0x0708  
-
 #define I2C_SMBUS 0x0720  
-
 #endif