diff --git a/src/source/building-devices.md b/src/source/building-devices.md
index 0d02b97..4b0dad7 100644
--- a/src/source/building-devices.md
+++ b/src/source/building-devices.md
@@ -76,6 +76,7 @@
 Device   | Keys
 ---------|------
 grouper  | Press *Power* for a second, and press *Volume Down* when the bootloader logo appears
+phantasm | Power the device, cover it with one hand after the LEDs light up and until they turn red
 maguro   | Press and hold both *Volume Up* and *Volume Down*, then press and hold *Power*
 toro     | Press and hold both *Volume Up* and *Volume Down*, then press and hold *Power*
 panda    | Press and hold *Input*, then press *Power*