diff --git a/source/_components/rpi_pfio.markdown b/source/_components/rpi_pfio.markdown
index 1b3c4785e53..c7003ef5f4d 100644
--- a/source/_components/rpi_pfio.markdown
+++ b/source/_components/rpi_pfio.markdown
@@ -16,3 +16,7 @@ ha_iot_class: "Local Push"
 The `rpi_pfio` component is the base for all related [PiFace Digital I/O (PFIO)](http://www.piface.org.uk/) platforms in Home Assistant. There is no setup needed for the component itself; for the platforms, please check their corresponding pages.
 
 Set the jumpers on the PiFace board for address 0 (JP1: 1-2, JP2: 1-2).
+
+## {% linkable_title Use with HassOS %}
+
+Note that the PiFace Digital 2 uses the Raspberry Pi SPI port, which is disabled by default when using [HassOS](https://github.com/home-assistant/hassos). When using HassOS, you must mount the SD card on another computer and access the boot partition on the card. Edit the `config.txt` file and add the line `dtparam=spi=on` to the end. This should enable SPI when HassOS is booted and allow Home Assistant to access the PiFace Digital 2 board.