diff --git a/homeassistant/components/zwave_js/services.yaml b/homeassistant/components/zwave_js/services.yaml
index dd66a0c7f29..d2f1c75b64e 100644
--- a/homeassistant/components/zwave_js/services.yaml
+++ b/homeassistant/components/zwave_js/services.yaml
@@ -27,6 +27,7 @@ set_lock_usercode:
     code_slot:
       name: Code slot
       description: Code slot to set the code.
+      required: true
       example: 1
       selector:
         text: