diff --git a/docs/v3.md b/docs/v3.md
index ec9011b0..23d667d9 100644
--- a/docs/v3.md
+++ b/docs/v3.md
@@ -165,6 +165,9 @@ To manage the power of your computer, you will need to install an ATX adapter bo
     19. **1-Wire** & **Neo-pixel** interface (under, advanced user feature).
 
 ??? note "GPIO pinout"
+
+!!! warning "Before proceeding, make sure that the mb you are using has normal ATX headers"
+
     * **ATX control**
       - `power led = GPIO 24` - Used for reading the host power state.
       - `hdd led = 22` - Same for the HDD activity.