Update README.md: allowing external sources

README.md

@@ -26,7 +26,7 @@ Q: In which subject did you excel the most?
 A: English. I always got low grades in science and maths because *I never enjoyed them.*
 
 Label: `invalid`  
-Reason: The interviewee first said they loved science and math, but later claimed they never enjoyed them and received low grades—this is a contradiction (Refer to the italicised text.).
+Reason: The interviewee initially stated they loved science and math, but later claimed they never enjoyed them and received low grades—this is a contradiction (Refer to the italicised text.).
 ```
 
 Please read each conversation carefully– it's easy to overlook subtle contradictions!
@@ -37,6 +37,8 @@ You do **not** need to consider consistency across different conversations— ev
 
 You also do **not** need any external or real-world knowledge—basic reasoning (like simple arithmetic) is sufficient.
 
+If needed, you may look up general background knowledge (e.g., grade levels in the U.S. education system).
+
 We sincerely appreciate your time.
 
 If you have any inquiries or want to report issues, feel free to reach out at any time:
@@ -70,6 +72,8 @@ Reason: 처음엔 수학이랑 과학을 좋아했다고 했는데, 이후에
 
 또한, 일관성을 판단하기 위한 외부 지식(실제 발생한 사건 등)은 전혀 필요하지 않습니다. 기초적인 산술 정도면 충분합니다.
 
+간단한 배경 지식이 필요한 샘플들이 있는데, 이런 것들은 검색해서 확인하셔도 무방합니다(예: 미국의 학년 체계 등).
+
 시간 내어 참여해주셔서 다시 한 번 감사드립니다 :)
 
 문의사항이 있으시거나 문제를 발견하시면 언제든 편하게 연락주세요.