diff --git a/scripts/image_signing/set_gbb_flags.sh b/scripts/image_signing/set_gbb_flags.sh
index 4d5925c..d2cba49 100755
--- a/scripts/image_signing/set_gbb_flags.sh
+++ b/scripts/image_signing/set_gbb_flags.sh
@@ -23,21 +23,24 @@
 GBBFLAGS_DESCRIPTION="
   Defined flags (some values may be not supported by all systems):
 
-  GBB_FLAG_DEV_SCREEN_SHORT_DELAY     0x00000001
-  GBB_FLAG_LOAD_OPTION_ROMS           0x00000002
-  GBB_FLAG_ENABLE_ALTERNATE_OS        0x00000004
-  GBB_FLAG_FORCE_DEV_SWITCH_ON        0x00000008
-  GBB_FLAG_FORCE_DEV_BOOT_USB         0x00000010
-  GBB_FLAG_DISABLE_FW_ROLLBACK_CHECK  0x00000020
-  GBB_FLAG_ENTER_TRIGGERS_TONORM      0x00000040
-  GBB_FLAG_FORCE_DEV_BOOT_LEGACY      0x00000080
-  GBB_FLAG_FAFT_KEY_OVERIDE           0x00000100
-  GBB_FLAG_DISABLE_EC_SOFTWARE_SYNC   0x00000200
-  GBB_FLAG_DEFAULT_DEV_BOOT_LEGACY    0x00000400
-  GBB_FLAG_DISABLE_PD_SOFTWARE_SYNC   0x00000800
+  GBB_FLAG_DEV_SCREEN_SHORT_DELAY            0x00000001
+  GBB_FLAG_LOAD_OPTION_ROMS                  0x00000002
+  GBB_FLAG_ENABLE_ALTERNATE_OS               0x00000004
+  GBB_FLAG_FORCE_DEV_SWITCH_ON               0x00000008
+  GBB_FLAG_FORCE_DEV_BOOT_USB                0x00000010
+  GBB_FLAG_DISABLE_FW_ROLLBACK_CHECK         0x00000020
+  GBB_FLAG_ENTER_TRIGGERS_TONORM             0x00000040
+  GBB_FLAG_FORCE_DEV_BOOT_LEGACY             0x00000080
+  GBB_FLAG_FAFT_KEY_OVERIDE                  0x00000100
+  GBB_FLAG_DISABLE_EC_SOFTWARE_SYNC          0x00000200
+  GBB_FLAG_DEFAULT_DEV_BOOT_LEGACY           0x00000400
+  GBB_FLAG_DISABLE_PD_SOFTWARE_SYNC          0x00000800
+  GBB_FLAG_DISABLE_LID_SHUTDOWN              0x00001000
+  GBB_FLAG_FORCE_DEV_BOOT_FASTBOOT_FULL_CAP  0x00002000
 
   To get a developer-friendly device, try 0x11 (short_delay + boot_usb).
   For factory-related tests (always DEV), try 0x39.
+  For early development (disable EC/PD software sync), try 0xa39.
 "
 
 FLAGS_HELP="Changes ChromeOS Firmware GBB Flags value.