diff --git a/src/event/Cancellable.php b/src/event/Cancellable.php
index 023549023..e01d0b52d 100644
--- a/src/event/Cancellable.php
+++ b/src/event/Cancellable.php
@@ -24,10 +24,18 @@ declare(strict_types=1);
 namespace pocketmine\event;
 
 /**
- * Events that can be cancelled must use the interface Cancellable
+ * This interface is implemented by an Event subclass if and only if it can be cancelled.
+ *
+ * The cancellation of an event directly affects whether downstream event handlers
+ * without `@handleCancelled` will be called with this event.
+ * Implementations may provide a direct setter for cancellation (typically by using `CancellableTrait`)
+ * or implement an alternative logic (such as a function on another data field) for `isCancelled()`.
  */
 interface Cancellable{
+	/**
+	 * Returns whether this instance of the event is currently cancelled.
+	 *
+	 * If it is cancelled, only downstream handlers that declare `@handleCancelled` will be called with this event.
+	 */
 	public function isCancelled() : bool;
-
-	public function setCancelled(bool $value = true) : void;
 }