diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index 84f238d1b3..9da1acefa4 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -972,7 +972,7 @@ class Process implements \IteratorAggregate
     }
 
     /**
-     * Sets the process timeout (max. runtime).
+     * Sets the process timeout (max. runtime) in seconds.
      *
      * To disable the timeout, set this value to null.
      *