diff --git a/Tuya-generic-wifi-curtain-motor-WIP.md b/Tuya-generic-wifi-curtain-motor-WIP.md
index 02ad2685..44772dd4 100644
--- a/Tuya-generic-wifi-curtain-motor-WIP.md
+++ b/Tuya-generic-wifi-curtain-motor-WIP.md
@@ -1,4 +1,6 @@
 The WiFi Curtain Motor was bought here http://tiny.cc/gihgdz
+[Tuya Serial Protocols Communication for CurtainM](https://github.com/arendst/Sonoff-Tasmota/files/3658412/protocol_CurtainM_20190926.pdf)
+
 ```Setup for the functionId and dpId that was made:
 stat/sonoff/RESULT = [{"fnId":11, "dpId":1},{"fnId":12, "dpId":101},{"fnId":13, "dpId":103}]