diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index c267f6896c..b5eb7f77d5 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -1000,7 +1000,7 @@ class Process
     /**
      * Sets the environment variables.
      *
-     * An environment variable value should be a string.
+     * Each environment variable value should be a string.
      * If it is an array, the variable is ignored.
      *
      * That happens in PHP when 'argv' is registered into