diff --git a/README.md b/README.md
index 150b83c..fd0762e 100644
--- a/README.md
+++ b/README.md
@@ -29,3 +29,7 @@ out4 - layer fan
 #### Temperature probes
 temp0 - Bed thermistor
 temp1 - Hotend thermistor
+
+## Useful links
+[GCode library](https://duet3d.dozuki.com/Wiki/Gcode)
+[RatRig vcore3 docs](https://ratrig.dozuki.com/c/Rat_Rig_V-Core_3)