diff --git a/libs/microbit/pins.cpp b/libs/microbit/pins.cpp
index 0589aa7c..a262018d 100644
--- a/libs/microbit/pins.cpp
+++ b/libs/microbit/pins.cpp
@@ -159,7 +159,7 @@ namespace pins {
     /**
     * Gets the duration of the last pulse in micro-seconds. This function should be called from a ``onPulsed`` handler.
     */
-    //% help=pins/pulse-micros
+    //% help=pins/pulse-duration
     //% blockId=pins_pulse_duration block="pulse duration (µs)"
     //% weight=21
     int pulseDuration() {