diff --git a/README.md b/README.md
index b2ba394..9607df1 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,12 @@
 RangeBar
 ===============
+
+This range bar project have dll file and source code.
+
+You can compile file by yourself or use dll file directly.
+
+There are 2 events.
+
+RangeChanged: This event is triggered after the bar dragged by mouse (mouse up)
+
+RangeChanging: This event is triggered when the bar dragged by mouse
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