diff --git a/source/event-emitter.ts b/source/event-emitter.ts
index d369166..a5381d8 100644
--- a/source/event-emitter.ts
+++ b/source/event-emitter.ts
@@ -21,6 +21,9 @@ interface ListenerEntry<T> {
     once?: boolean;
 }
 
+/**
+ * Callback returned by {@link on} and {@link once} for removing a listener.
+ */
 export type OffCallback = () => void;
 
 /**