diff --git a/docs/software/settings/power.md b/docs/software/settings/power.md
index 00815972..441a0091 100644
--- a/docs/software/settings/power.md
+++ b/docs/software/settings/power.md
@@ -34,6 +34,7 @@ For a description and more information on what exactly all of these mean, please
 | ls_secs | `integer` (seconds) | `0` |
 | mesh_sds_timeout_secs | `integer` (seconds) | `0` |
 | min_wake_secs | `integer` (seconds) | `0` |
+| on_battery_shutdown_after_secs | `integer` (seconds) | `0` |
 | phone_sds_timeout_sec | `integer` (seconds) | `0` |
 | phone_timeout_secs | `integer` (seconds) | `0` |
 | screen_on_secs | `integer` (seconds) | `0` |
@@ -82,6 +83,10 @@ Power management state machine option. See the [power page](/docs/software/other
 
 Power management state machine option. See the [power page](/docs/software/other/power)for details. 0 for default of 10 seconds
 
+### on_battery_shutdown_after_secs
+
+If non-zero, the device will fully power off this many seconds after external power is removed.
+
 ### phone_sds_timeout_sec
 
 Power management state machine option. See the [power page](/docs/software/other/power) for details. 0 for default of two hours, use the MAXUINT or 4294967295 to disable