diff --git a/packages/pinball_components/lib/src/components/signpost.dart b/packages/pinball_components/lib/src/components/signpost.dart
index 02d2eb19..b263464b 100644
--- a/packages/pinball_components/lib/src/components/signpost.dart
+++ b/packages/pinball_components/lib/src/components/signpost.dart
@@ -41,6 +41,8 @@ extension on SignpostSpriteState {
 
 /// {@template signpost}
 /// A sign, found in the Flutter Forest.
+///
+/// Lights up a new sign whenever all three [DashNestBumper]s are hit.
 /// {@endtemplate}
 class Signpost extends BodyComponent with InitialPosition {
   /// {@macro signpost}