diff --git a/README.md b/README.md
index 25e7c14..180c21c 100644
--- a/README.md
+++ b/README.md
@@ -4,3 +4,10 @@ based on 2 wiper motors, NRF24 and a VNH2SP30 motor driver based arduino shield
 ![](https://i.imgur.com/jb0e2Xa.png)
 ![](https://i.imgur.com/SxAtMcw.png)
 ![](https://i.imgur.com/LzyucU1.png)
+
+##relay guides
+http://www.learningaboutelectronics.com/Articles/DPDT-relay-wiring-diagram
+
+http://www.me.umn.edu/courses/me2011/arduino/technotes/dcmotors/bidirectional/bidirMotor.html
+
+![](http://i.imgur.com/Yjcg2WQ.jpg)