diff --git a/schemas/api-config/config.json b/schemas/api-config/config.json
index 674e305..8789fa2 100644
--- a/schemas/api-config/config.json
+++ b/schemas/api-config/config.json
@@ -21,19 +21,19 @@
             }
         },
         "collections": {
-            "oneOf": [
-                {
-                    "$comment": "for include tag",
-                    "type": "string"
-                },
-                {
-                    "type": "array",
-                    "description": "list of collections in this project",
-                    "items": {
+            "type": "array",
+            "description": "list of collections in this project",
+            "items": {
+                "oneOf": [
+                    {
+                        "$comment": "for include tag",
+                        "type": "string"
+                    },
+                    {
                         "$ref": "collection.json"
                     }
-                }
-            ]
+                ]
+            }
         }
     },
     "required": ["namespace"]