diff --git a/src/main/resources/swagger.api/schemas/field.json b/src/main/resources/swagger.api/schemas/field.json
index bce9182..65398ee 100644
--- a/src/main/resources/swagger.api/schemas/field.json
+++ b/src/main/resources/swagger.api/schemas/field.json
@@ -54,6 +54,10 @@
       "items": {
         "$ref": "valueWithLabel.json"
       }
+    },
+    "ecsOnly": {
+      "description": "Indicates if the field is available only in ECS environments",
+      "type": "boolean"
     }
   },
   "required": ["name", "dataType"]