diff --git a/platform-OpenWrt/README.md b/platform-OpenWrt/README.md
index 0db4461..18687ab 100755
--- a/platform-OpenWrt/README.md
+++ b/platform-OpenWrt/README.md
@@ -1,5 +1,12 @@
 Instructions for [TP-Link TL-MR3020 v1](https://openwrt.org/toh/tp-link/tl-mr3020)
 
+Based on [OpenWrt Hello World guide](https://openwrt.org/docs/guide-developer/helloworld/start)
+
 1. Use Linux host
 1. Download the last supported [SDK 17.01.7](https://downloads.openwrt.org/releases/17.01.7/targets/ar71xx/generic/lede-sdk-17.01.7-ar71xx-generic_gcc-5.4.0_musl-1.1.16.Linux-x86_64.tar.xz)
-1.
+1. Unpack it to `~/openwrt-sdk`:
+	```
+	tar -xf lede-sdk-17.01.7-ar71xx-generic_gcc-5.4.0_musl-1.1.16.Linux-x86_64.tar.xz
+	mv lede-sdk-17.01.7-ar71xx-generic_gcc-5.4.0_musl-1.1.16.Linux-x86_64 ~/openwrt-sdk
+	```
+1.