diff --git a/Hardware-design-files.md b/Hardware-design-files.md
index b407f7a..959ad56 100644
--- a/Hardware-design-files.md
+++ b/Hardware-design-files.md
@@ -2,6 +2,8 @@
 
 [DieselHeater.pdf](uploads/fdae5fae2f96549175ded789e84dc991/DieselHeater.pdf)
 
+## Production PCB considerations
+
 ### Special parts for "green board" build
 **Discrete single pin sockets**: eg: RS 718-5284. (low profile)  
 ![HolTiteSocket](uploads/fc0703aa92c3d3cc559e8b56cd7e57ac/HolTiteSocket.jpg)