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diff --git a/host/docs/gpio_api.dox b/host/docs/gpio_api.dox
index bcea7c5c8..8617000ad 100644
--- a/host/docs/gpio_api.dox
+++ b/host/docs/gpio_api.dox
@@ -11,6 +11,8 @@ by an ATR (Automatic Transmit / Receive). This allows them to be toggled
simultaneously with other radio-level changes (e.g., enabling or
disabling a TX or RX mixer).
+For information on the X410 GPIO, see \ref page_x400_gpio_api
+
\subsection xgpio_fpanel_gpio X3x0 Front Panel GPIO
The GPIO port is not meant to drive big loads. You should not try to source more than 5mA per pin.