diff --git a/src/features/phase/mod.rs b/src/features/phase/mod.rs
index 2eb0efa..ba6c001 100644
--- a/src/features/phase/mod.rs
+++ b/src/features/phase/mod.rs
@@ -101,6 +101,7 @@ fn tick_timer(
     }
 }
 
+// Rewards the player at the end of a focus phase with `berries_per_focus_minute` * `focus_duration`
 fn grant_focus_rewards(
     mut messages: MessageReader<PhaseTimerFinishedMessage>,
     config: Res<GameConfig>,