diff --git a/docs/configuration/rak-gpio-mapping.mdx b/docs/configuration/rak-gpio-mapping.mdx
index 528392e3..e5280c7b 100644
--- a/docs/configuration/rak-gpio-mapping.mdx
+++ b/docs/configuration/rak-gpio-mapping.mdx
@@ -30,3 +30,7 @@ meshtastic --set external_notification.output 10
 ```
 This will use IO6 on a RAK4631
 
+:::caution Note
+There is no usable GPIO pin on any RAK base board except the 'big' baseboard RAK19001 without adding a RAK13002 IO module or a third party IO sensor breakout.
+:::
+