diff --git a/src/StreamSelectLoop.php b/src/StreamSelectLoop.php
index 41dd2cb3..5d308610 100644
--- a/src/StreamSelectLoop.php
+++ b/src/StreamSelectLoop.php
@@ -234,7 +234,7 @@ private function waitForStreamActivity($timeout)
         }
         if (false === $available) {
             // if a system call has been interrupted,
-            // we cannot rely on it's outcome
+            // we cannot rely on its outcome
             return;
         }