diff --git a/libc/kernel/common/linux/rtc.h b/libc/kernel/common/linux/rtc.h
index b51bc71..e437060 100644
--- a/libc/kernel/common/linux/rtc.h
+++ b/libc/kernel/common/linux/rtc.h
@@ -7,66 +7,77 @@
  ***   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_RTC_H_
 #define _LINUX_RTC_H_
-
 struct rtc_time {
  int tm_sec;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int tm_min;
  int tm_hour;
  int tm_mday;
  int tm_mon;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int tm_year;
  int tm_wday;
  int tm_yday;
  int tm_isdst;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-
 struct rtc_wkalrm {
  unsigned char enabled;
  unsigned char pending;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  struct rtc_time time;
 };
-
 struct rtc_pll_info {
  int pll_ctrl;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int pll_value;
  int pll_max;
  int pll_min;
  int pll_posmult;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int pll_negmult;
  long pll_clock;
 };
-
 #define RTC_AIE_ON _IO('p', 0x01)  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define RTC_AIE_OFF _IO('p', 0x02)  
 #define RTC_UIE_ON _IO('p', 0x03)  
 #define RTC_UIE_OFF _IO('p', 0x04)  
 #define RTC_PIE_ON _IO('p', 0x05)  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define RTC_PIE_OFF _IO('p', 0x06)  
 #define RTC_WIE_ON _IO('p', 0x0f)  
 #define RTC_WIE_OFF _IO('p', 0x10)  
-
 #define RTC_ALM_SET _IOW('p', 0x07, struct rtc_time)  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define RTC_ALM_READ _IOR('p', 0x08, struct rtc_time)  
 #define RTC_RD_TIME _IOR('p', 0x09, struct rtc_time)  
 #define RTC_SET_TIME _IOW('p', 0x0a, struct rtc_time)  
 #define RTC_IRQP_READ _IOR('p', 0x0b, unsigned long)  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define RTC_IRQP_SET _IOW('p', 0x0c, unsigned long)  
 #define RTC_EPOCH_READ _IOR('p', 0x0d, unsigned long)  
 #define RTC_EPOCH_SET _IOW('p', 0x0e, unsigned long)  
-
 #define RTC_WKALM_SET _IOW('p', 0x0f, struct rtc_wkalrm) 
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define RTC_WKALM_RD _IOR('p', 0x10, struct rtc_wkalrm) 
-
 #define RTC_PLL_GET _IOR('p', 0x11, struct rtc_pll_info)  
 #define RTC_PLL_SET _IOW('p', 0x12, struct rtc_pll_info)  
-
 #define RTC_IRQF 0x80  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define RTC_PF 0x40
 #define RTC_AF 0x20
 #define RTC_UF 0x10
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */