diff --git a/backend/lib/doc/Configuration.openapi.json b/backend/lib/doc/Configuration.openapi.json
index 0462c57f..dc05ef03 100644
--- a/backend/lib/doc/Configuration.openapi.json
+++ b/backend/lib/doc/Configuration.openapi.json
@@ -90,6 +90,10 @@
                 "$ref": "#/components/schemas/ValetudoCustomizationsDTO"
               }
             }
+          },
+          "_version": {
+            "type": "string",
+            "description": "Used for migration purposes"
           }
         }
       },