diff --git a/README.md b/README.md
index 9b71f84..3da6237 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ public function indexAction()
         <tr>
             {% for day in week %}
                 <td>
-                    {% if month.contains(day) %}
+                    {% if month.contains(day.begin) %}
                         {{ day.begin.format('d') }}
                     {% else %}
                         &nbsp;