explain reason to use reflect2
diff --git a/README.md b/README.md
index 9702010..e8af1f8 100644
--- a/README.md
+++ b/README.md
@@ -12,4 +12,6 @@
* reflect get/set interface{}, with type checking
* reflect get/set unsafe.Pointer, without type checking
-[json-iterator](https://github.com/json-iterator/go) use this package to save runtime dispatching cost.
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+[json-iterator](https://github.com/json-iterator/go) use this package to save runtime dispatching cost.
+This package is designed for low level libraries to optimize reflection performance.
+General application should still use reflect standard library.
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