diff --git a/src/EventLoopInterface.php b/src/EventLoopInterface.php
index c6905d2..ab5768d 100644
--- a/src/EventLoopInterface.php
+++ b/src/EventLoopInterface.php
@@ -4,4 +4,53 @@ namespace Interop\Async\EventLoop;
 
 interface EventLoopInterface
 {
+    /**
+     * @return void
+     */
+    public function run(callable $onStart = null);
+
+    /**
+     * @return void
+     */
+    public function tick(bool $block = true);
+
+    /**
+     * @return void
+     */
+    public function stop();
+
+    /**
+     * @return Watcher
+     */
+    public function queue(callable $callback, ...$args);
+
+    /**
+     * @return Watcher
+     */
+    public function timer(callable $callback, float $time, $data = null);
+
+    /**
+     * @return Watcher
+     */
+    public function periodic(callable $callback, float $interval, $data = null);
+
+    /**
+     * @return Watcher
+     */
+    public function onReadable($stream, callable $callback, $data = null);
+
+    /**
+     * @return Watcher
+     */
+    public function onWritable($stream, callable $callback, $data = null);
+
+    /**
+     * @return Watcher
+     */
+    public function onSignal(int $signo, callable $callback, $data = null);
+
+    /**
+     * @return Watcher
+     */
+    public function onError(callable $callback);
 }