diff --git a/extra/rosetta-code/metronome/metronome.factor b/extra/rosetta-code/metronome/metronome.factor
index e7fa848c2a..2a22907bf2 100644
--- a/extra/rosetta-code/metronome/metronome.factor
+++ b/extra/rosetta-code/metronome/metronome.factor
@@ -39,4 +39,6 @@ IN: rosetta-code.metronome
     [ start-metronome-timer ] dip
     [ run-metronome ] curry [ stop-timer ] [ ] cleanup ;
 
-! example usage: 60 { 440 220 330 } metronome
+: metronome-example ( -- ) 60 { 440 220 330 } metronome ;
+
+MAIN: metronome-example