Update README.md

README.md

@@ -63,7 +63,7 @@ A typical data instance consists of an image and a corresponding set of object a
 
   * `image`: A PIL Image object containing the image of a beetle specimen.
   * `objects`: A dictionary containing annotation information.
-      * `bbox`: A list of bounding boxes, where each box is in `[x_min, y_min, width, height]` format.
+      * `bbox`: A list of bounding boxes, where each box is in `[x_1, y_1, x_2, y_2]` format.
       * `category`: A list of string labels corresponding to the species of the beetle in each bounding box. There are **63 unique species categories** in the dataset.
 
 #### Data Splits