diff --git a/README.md b/README.md
index 3afe29b..a3f5be1 100644
--- a/README.md
+++ b/README.md
@@ -22,10 +22,10 @@ Clone this component to [ESP-IDF](https://github.com/espressif/esp-idf) project
 git submodule add https://github.com/tuanpmt/espmqtt.git components/espmqtt
 ```
 
-Or run a sample (make sure you have `IDF_PATH` env): 
+Or run a sample (make sure you have installed the [toolchain](http://esp-idf.readthedocs.io/en/latest/get-started/index.html#setup-toolchain)): 
 
 ```
-git clonehttps://github.com/tuanpmt/espmqtt.git
+git clone https://github.com/tuanpmt/espmqtt.git
 cd espmqtt/examples/mqtt_tcp
 make menuconfig
 make flash monitor