diff --git a/ports/zephyr-cp/bindings/zephyr_serial/UART.c b/ports/zephyr-cp/bindings/zephyr_serial/UART.c
index 1d7d9fa842..dbb643645f 100644
--- a/ports/zephyr-cp/bindings/zephyr_serial/UART.c
+++ b/ports/zephyr-cp/bindings/zephyr_serial/UART.c
@@ -24,7 +24,7 @@
 
 //| class UART:
 //|     """A bidirectional serial protocol. Already initialized for Zephyr defined
-//|        busses in `board`.
+//|        busses in :py:mod:`board`.
 //|
 //|     .. raw:: html
 //|