diff --git a/GoUsers.md b/GoUsers.md
index 3439ef8a..4454d194 100644
--- a/GoUsers.md
+++ b/GoUsers.md
@@ -326,7 +326,8 @@
   * [Doozer](https://www.doozer.de) - [github](https://github.com/doozer-de)
   * [Centrifuge](http://centrifuge.one) - [github](https://github.com/centrifuge)
   * [Delivery Hero](https://www.deliveryhero.com/)
-  * [EGYM](https://www.egym.de/) - [Blog](https://code.egym.de/) 
+  * [EGYM](https://www.egym.de/) - [Blog](https://code.egym.de/)
+  * [ESG Book](https://www.esgbook.com/)
   * [ESONO AG](https://www.esono.de/)
   * [FastBill](https://www.fastbill.com/)
   * [Fraugster](https://fraugster.com/)