diff --git a/Hardware-design-files.md b/Hardware-design-files.md
index b9974d7..c861b5d 100644
--- a/Hardware-design-files.md
+++ b/Hardware-design-files.md
@@ -2,6 +2,18 @@
 
 [DieselHeater.pdf](uploads/fdae5fae2f96549175ded789e84dc991/DieselHeater.pdf)
 
+**NOTE:**  
+The schematic shows an I2C EEPROM.  
+This is not presently supported but was added to the production board as it makes no difference to the board production, and may be handy in the future.  
+As such, this can be omitted from the build.  
+Non volatile storage is achieved using the "persistent" class available in the ESP32 software suite (uses FLASH memory).
+
+## Gerber & NC drill design files
+[BTCheater.zip](uploads/1390e8b392675d0606f3917f847d874c/BTCheater.zip)
+
+The first green PCBs were produced by Seed Studio Fusion, 10 10x10cm boards for $4.90 USD, 2 fit into this area so 20 boards all up for 5USD, a steal.  
+I can wholeheartedly recommend their services, very good quality, and most importantly, very reasonable shipping rates.
+
 ## Production PCB considerations
 
 ### Special parts for "green board" build