diff --git a/hardware/ecp5_mainboard/mainboard_prod/ecp5_mainboard_bom_advancedassembly-export.xls b/hardware/ecp5_mainboard/mainboard_prod/ecp5_mainboard_bom_advancedassembly-export.xls
index 8730782..c154778 100644
Binary files a/hardware/ecp5_mainboard/mainboard_prod/ecp5_mainboard_bom_advancedassembly-export.xls and b/hardware/ecp5_mainboard/mainboard_prod/ecp5_mainboard_bom_advancedassembly-export.xls differ
diff --git a/hardware/ecp5_mainboard/mainboard_prod/readme-advancedassembly.txt b/hardware/ecp5_mainboard/mainboard_prod/readme-advancedassembly.txt
index 983f58a..c1d229a 100644
--- a/hardware/ecp5_mainboard/mainboard_prod/readme-advancedassembly.txt
+++ b/hardware/ecp5_mainboard/mainboard_prod/readme-advancedassembly.txt
@@ -32,8 +32,8 @@ PCB specification:
  - FR4 material.
  - 1.6mm board thickness.
  - 1oz copper thickness.
- - 3mil track/3mil space.
- - 0.2mm minimum hole diameter.
+ - 3mil track/3mil space (.003").
+ - 0.2mm (0.0077") minimum hole diameter.
  - ENIG surface finish.
  - No gold fingers.
  - 30 degree bevelling for card edge connector. "15 mils bevel depth with 45 degree angle" OK alternate.