diff --git a/src/EventLoopInterface.php b/src/EventLoopInterface.php
index 1bc2e1b..27c1c5d 100644
--- a/src/EventLoopInterface.php
+++ b/src/EventLoopInterface.php
@@ -5,62 +5,111 @@ namespace Interop\Async\EventLoop;
 interface EventLoopInterface
 {
     /**
+     * Start the event loop.
+     * 
      * @return void
      */
-    public function run(callable $onStart = null);
+    public function run();
 
     /**
+     * Stop the event loop.
+     * 
      * @return void
      */
     public function stop();
 
     /**
-     * @return string
+     * Defer the execution of a callback.
+     * 
+     * @param callable $callback The callback to defer.
+     * 
+     * @return string An identifier that can be used to cancel, enable or disable the event.
      */
     public function defer(callable $callback);
 
     /**
-     * @return string
+     * Delay the execution of a callback. The time delay is approximate and accuracy is not guaranteed.
+     * 
+     * @param callable $callback The callback to delay.
+     * @param float $time The amount of time, in seconds, to delay the execution for.
+     * 
+     * @return string An identifier that can be used to cancel, enable or disable the event.
      */
     public function delay(callable $callback, float $time);
 
     /**
-     * @return string
+     * Repeatedly execute a callback. The interval between executions is approximate and accuracy is not guaranteed.
+     * 
+     * @param callable $callback The callback to repeat.
+     * @param float $interval The time interval, in seconds, to wait between executions.
+     * 
+     * @return string An identifier that can be used to cancel, enable or disable the event.
      */
     public function repeat(callable $callback, float $interval);
 
     /**
-     * @return string
+     * Execute a callback when a stream resource becomes readable.
+     * 
+     * @param resource $stream The stream to monitor.
+     * @param callable $callback The callback to execute.
+     * 
+     * @return string An identifier that can be used to cancel, enable or disable the event.
      */
     public function onReadable($stream, callable $callback);
 
     /**
-     * @return string
+     * Execute a callback when a stream resource becomes writable.
+     * 
+     * @param resource $stream The stream to monitor.
+     * @param callable $callback The callback to execute.
+     * 
+     * @return string An identifier that can be used to cancel, enable or disable the event.
      */
     public function onWritable($stream, callable $callback);
 
     /**
-     * @return string
+     * Execute a callback when a signal is received.
+     * 
+     * @param int $signo The signal number to monitor.
+     * @param callable $callback The callback to execute.
+     * 
+     * @return string An identifier that can be used to cancel, enable or disable the event.
      */
     public function onSignal(int $signo, callable $callback);
 
     /**
-     * @return string
+     * Execute a callback when an error occurs.
+     * 
+     * @param callable $callback The callback to execute.
+     * 
+     * @return string An identifier that can be used to cancel, enable or disable the event.
      */
     public function onError(callable $callback);
 
     /**
+     * Enable an event.
+     * 
+     * @param string $eventIdentifier The event identifier.
+     * 
      * @return void
      */
-    public function enable(string $watcherId);
+    public function enable(string $eventIdentifier);
 
     /**
+     * Disable an event.
+     * 
+     * @param string $eventIdentifier The event identifier.
+     * 
      * @return void
      */
-    public function disable(string $watcherId);
+    public function disable(string $eventIdentifier);
 
     /**
+     * Cancel an event.
+     * 
+     * @param string $eventIdentifier The event identifier.
+     * 
      * @return void
      */
-    public function cancel(string $watcherId);
+    public function cancel(string $eventIdentifier);
 }