Update README.md

README.md

@@ -52,7 +52,7 @@ All of our data is available on [Hugging Face](https://huggingface.co/datasets/r
   "user_prompt": Question text, with <video> as a placeholder for video and <image> for auxiliary images,
   "format_prompt": Output format requirements,
   "ground_truth": Correct answer,
-  "hint": The rationale used when reviewing annotation questions for acceptance, it can serve as a reference prompt if the problem is too difficult.
+  "hint": The rationale used when reviewing annotation questions for acceptance, which can serve as a reference prompt if the problem is too difficult.
 }
 ```