Update README.md

README.md

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 <!-- Provide a quick summary of what the model is/does. -->
 
-This modelcard documents FM-FCI/DateArith-VLSP2025, a Vietnamese LLM fine-tuned for duration question answering task. It achieved #4 in the VLSP 2025 benchmark for date-arith task.
+This modelcard documents FM-FCI/DurationQA-VLSP2025, a Vietnamese LLM fine-tuned for duration question answering task. It achieved #4 in the VLSP 2025 benchmark for date-arith task.
 
 ## Model Details