diff --git a/How-to-build.md b/How-to-build.md
index 79a98af..33aa0b4 100644
--- a/How-to-build.md
+++ b/How-to-build.md
@@ -52,7 +52,7 @@ After:
 
 ![image](https://dl.dropboxusercontent.com/s/u5rn6xjj3bszygz/clkgensolder%20%281%29.jpg?dl=1)    
 
-Here you only need to solder a 1x7 male pin header.     
+Here you only need to solder a 1x7 male pin header. Be sure to solder it the right way around like in the pictures, it won't work upside down.     
     
 ![image](https://dl.dropboxusercontent.com/s/j4wa5dd07gn2bp4/clkgensolder%20%282%29.jpg?dl=1)