diff --git a/xyz/openbmc_project/State/Chassis.interface.yaml b/xyz/openbmc_project/State/Chassis.interface.yaml
index 37d67e1..cc8a130 100644
--- a/xyz/openbmc_project/State/Chassis.interface.yaml
+++ b/xyz/openbmc_project/State/Chassis.interface.yaml
@@ -47,6 +47,12 @@
         - name: 'Off'
           description: >
             Chassis power is off
+        - name: 'TransitioningToOff'
+          description: >
+            Firmware is transitioning the chassis to an Off state
         - name: 'On'
           description: >
             Chassis power is on
+        - name: 'TransitioningToOn'
+          description: >
+            Firmware is transitioning the chassis to an On state