diff --git a/src/Context/WebApiContext.php b/src/Context/WebApiContext.php
index f21b24b..36840af 100644
--- a/src/Context/WebApiContext.php
+++ b/src/Context/WebApiContext.php
@@ -48,6 +48,9 @@ class WebApiContext implements ApiClientAwareContext
      */
     private $response;
 
+    /**
+     * @var array
+     */
     private $placeHolders = array();
 
     /**