diff --git a/README.md b/README.md
index 1230f07..e8bff3e 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,8 @@ For more details please refer to <https://github.com/leleliu008/ndk-pkg-package-
 
 ## Using ndk-pkg via [Docker](https://www.docker.com/)
 
+This is the recommended way of using this software due to docker container is an isolated environment where the running process can not be affected by your host system's environemt variables.
+
 **step1. create the ndk-pkg docker container**
 
 ```bash