diff --git a/Automatic-Voltage-Selection.md b/Automatic-Voltage-Selection.md
index 3896b68..d1cb21d 100644
--- a/Automatic-Voltage-Selection.md
+++ b/Automatic-Voltage-Selection.md
@@ -21,7 +21,7 @@ If you live in the USA, you can purchase a preassembled Vselect module [here](ht
 
 # Variations / Installation Options
 There are two installation options for Vselect available:
-* **If you have a main PCB prior to HW5 Rev4:** You will need the Vselect Module PCB.
+* **If you have a main PCB prior to HW5 Rev4:** You will need the [Vselect Module PCB](https://github.com/sanni/cartreader/tree/master/hardware/vselect).
 * **If you have a main PCB that is HW5 Rev4 or newer:** You do not need the Vselect Module PCB, however, you can still use the PCB on Rev4 and newer. Using the module PCB can be useful if you already have your OSCR or wish to purchase a module preassembled.
 
 # Components