diff --git a/to-be-continued.md b/to-be-continued.md
index b745fa0..a13a0fe 100644
--- a/to-be-continued.md
+++ b/to-be-continued.md
@@ -10,6 +10,8 @@ Because this tutorial was so well-received, it inspired me to write a book. The
 
 ### [Professional PHP: Building maintainable and secure applications](http://patricklouys.com/professional-php/)
 
+![](http://patricklouys.com/img/professional-php-thumb.png)
+
 Thanks for your time,
 
 Patrick