diff --git a/api/core/prompt/prompts.py b/api/core/prompt/prompts.py
index 781e8164cb..8e829d47ae 100644
--- a/api/core/prompt/prompts.py
+++ b/api/core/prompt/prompts.py
@@ -39,7 +39,7 @@ MORE_LIKE_THIS_GENERATE_PROMPT = (
 SUGGESTED_QUESTIONS_AFTER_ANSWER_INSTRUCTION_PROMPT = (
     "Please help me predict the three most likely questions that human would ask, "
     "and keeping each question under 20 characters.\n"
-    "The output must be in JSON format following the specified schema:\n"
+    "The output must be an array in JSON format following the specified schema:\n"
     "[\"question1\",\"question2\",\"question3\"]\n"
 )