diff --git a/openapi/machine-api.json b/openapi/machine-api.json
index 860968767..55c461c7d 100644
--- a/openapi/machine-api.json
+++ b/openapi/machine-api.json
@@ -251,6 +251,9 @@
       },
       "Message2": {
         "description": "A message from the printer.",
+        "enum": [
+          "ok"
+        ],
         "type": "string"
       },
       "Message3": {
@@ -858,6 +861,13 @@
               "project_file"
             ],
             "type": "string"
+          },
+          {
+            "description": "Stop the print.",
+            "enum": [
+              "stop"
+            ],
+            "type": "string"
           }
         ]
       },