diff --git a/designs/device-tree-gpio-naming.md b/designs/device-tree-gpio-naming.md
index 63b3500..0cec8c4 100644
--- a/designs/device-tree-gpio-naming.md
+++ b/designs/device-tree-gpio-naming.md
@@ -104,6 +104,9 @@
 condition is present. The status will reflect a standby regulator power faulted
 condition when an unexpected drop in standby power is detected.
 
+#### rtc-battery-voltage-read-enable
+Output pin that enables the ADC to read the board RTC battery voltage.
+
 ### Presence
 Pattern: `presence-*`