diff --git a/tests/prompts.json b/tests/prompts.json
index 2ea2077..6a41d8f 100644
--- a/tests/prompts.json
+++ b/tests/prompts.json
@@ -4,5 +4,6 @@
     "introduction": "Below is a selected piece of text:",
     "classify": "Now, can you determine if the above piece of text is written by a human or by a large language model?",
     "judge": "Now, can you determine if the above piece of text is written by a human or by a large language model? Please consider both options before coming up with a single-choice conclusion.",
-    "answer format": "Your answer must always end with your verdict that is either “human” or “AI” in a new line. "
+    "answer format": "Your answer must always end with your verdict that is only either “human” or “AI” in a new line as they are, without any other text or quotes. ",
+    "acceptable": ["human", "AI"]
 }
\ No newline at end of file