diff --git a/org/open_power/Control/Host.interface.yaml b/org/open_power/Control/Host.interface.yaml
index c5ac672..ea5e9a1 100644
--- a/org/open_power/Control/Host.interface.yaml
+++ b/org/open_power/Control/Host.interface.yaml
@@ -16,11 +16,14 @@
           - name: command
             type: enum[self.Command]
             description: Requested command to execute against the host
+          - name: data
+            type: variant[byte]
+            description: Data associated with the command.
 
 signals:
     - name: CommandComplete
       description: >
-        Signal indicating that a Command has completed
+        Signal indicating that a command has completed
       properties:
         - name: command
           type: enum[self.Command]
@@ -38,6 +41,7 @@
           description: >
             Host firmware should reset the OCC. This is invoked by
             OCC error monitor application on detecting the error.
+            Sensor ID of the failing OCC will be sent as data.
             This command will return once the command has been placed
             in command Queue.