diff --git a/examples/gpio/README.md b/examples/gpio/README.md
index 04ad433..a37b4cb 100644
--- a/examples/gpio/README.md
+++ b/examples/gpio/README.md
@@ -1,5 +1,7 @@
 # GPIO Example
 
+This example is a modified version of the GPIO example. The modification is made according to the [ESP Rainmaker Multi Device Laboratory](https://redmine.kozmotronik.com.tr/projects/espressif-sistemleri-laboratuvari/wiki/Multi_Device). Briefly, 2 more devices added over the GPIO device: RGB Light and Switch.
+
 ## Build and Flash firmware
 
 Follow the ESP RainMaker Documentation [Get Started](https://rainmaker.espressif.com/docs/get-started.html) section to build and flash this firmware. Just note the path of this example.