diff --git a/bbox.json b/bbox.json
index 1136bba..05afa44 100644
--- a/bbox.json
+++ b/bbox.json
@@ -2,17 +2,8 @@
     "$schema": "http://json-schema.org/draft-04/schema#",
     "id": "https://raw.githubusercontent.com/nhuebel/TopoJSON_schema/master/bbox.json",
     "title": "TopoJSON bounding box",
-    "description": "A bounding box as defined by TopoJSON",
+    "description": "A bounding box as defined by TopoJSON, (2*n) elements",
     "type": "array",
-    "items": { "$ref": "#/definitions/dimension" },
-    "minItems": 2,
-    "maxItems": 2,
-    "definitions": {
-      "dimension": { 
-	  "type": "array",
-	  "description": "This array should have an entry per dimension in the geometries",
-	  "items": {"type": "number"}
-      }
-    },
-    "TODO": "check number of dimensions (2*n), n being the number of dimensions represented in the contained geometries), with the lowest values for all axes followed by the highest values "
+    "items": {"type": "number"},
+    "minItems": 4,
 }
\ No newline at end of file