diff --git a/README.md b/README.md
index 937001e..d448c85 100644
--- a/README.md
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@@ -1 +1,3 @@
-# IOF: Input and Output in a common format
+# IOF: Input and Output in a Simple Format
+
+This library is mainly for some cases that need simple and fast I/O, such as online judge 
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