diff --git a/ProcessBuilder.php b/ProcessBuilder.php
index 1e383377..a782fd69 100644
--- a/ProcessBuilder.php
+++ b/ProcessBuilder.php
@@ -68,7 +68,7 @@ public function add($argument)
     }
 
     /**
-     * Adds an unescaped prefix to the command string.
+     * Adds a prefix to the command string.
      *
      * The prefix is preserved when resetting arguments.
      *