diff --git a/conf.py b/conf.py
index ada3eb9fcec1..027780505951 100644
--- a/conf.py
+++ b/conf.py
@@ -117,6 +117,7 @@
                     "ports/nrf/hal",
                     "ports/nrf/modules",
                     "ports/nrf/nrfx",
+                    "ports/nrf/usb",
                     "ports/pic16bit",
                     "ports/qemu-arm",
                     "ports/stm32",