diff --git a/Books.md b/Books.md
index 9ffba97..446b3e7 100644
--- a/Books.md
+++ b/Books.md
@@ -181,14 +181,14 @@
     * ISBN: --
     * Reference: [http://usegolang.com](http://usegolang.com)
 
-## Pre-order
-
   * **Go Systems Programming**
     * Author: Mihalis Tsoukalos
-    * Publication Date: October 2017
+    * Publication Date: September 2017
     * ISBN: 9781787125643
     * Reference: https://www.packtpub.com/networking-and-servers/go-systems-programming
 
+## Pre-order
+
   * **Black Hat Go**
     * Author: Tom Steele, Chris Patten, and Dan Kottmann
     * Publication Date: March 2018