diff --git a/meshtastic/admin.options b/meshtastic/admin.options
index 4a28ff2..d20a1a2 100644
--- a/meshtastic/admin.options
+++ b/meshtastic/admin.options
@@ -1,6 +1,7 @@
 *AdminMessage.payload_variant anonymous_oneof:true
 
 *AdminMessage.session_passkey max_size:8
+*AdminMessage.ota_hash max_size:32
 
 *AdminMessage.InputEvent.event_code int_size:8
 *AdminMessage.InputEvent.kb_char int_size:8
diff --git a/meshtastic/admin.proto b/meshtastic/admin.proto
index 396f6e0..5520446 100644
--- a/meshtastic/admin.proto
+++ b/meshtastic/admin.proto
@@ -479,6 +479,12 @@ message AdminMessage {
      * When true, favorites are preserved through reset.
      */
     bool nodedb_reset = 100;
+
+    /*
+     * A 32 byte hash of the OTA firmware.
+     * Used to verify the integrity of the firmware before applying an update.
+     */
+     bytes ota_hash = 102;
   }
 }