diff --git a/README.md b/README.md
index 1d0a836b1..5eae58052 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ Questions and Issues: [https://github.com/tqchen/xgboost/issues](https://github.
 
 xgboost-unity
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-experimental branch: refactor xgboost, cleaner code, more flexibility
+experimental branch(not usable yet): refactor xgboost, cleaner code, more flexibility
 
 Build
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