diff --git a/gnap4x4/readme.md b/gnap4x4/readme.md
index f77e5c9..d7f9352 100644
--- a/gnap4x4/readme.md
+++ b/gnap4x4/readme.md
@@ -1,6 +1,6 @@
 More info here:
 
-http://www.40percent.club/2018/04/gnap_4x4.html
+http://www.40percent.club/2018/04/gnap-4x4.html
 
 [How to order PCBs from gerber files](http://www.40percent.club/2017/03/ordering-pcb.html)