diff --git a/hardware/README.md b/hardware/README.md
index d7c987a..bd5fbbf 100644
--- a/hardware/README.md
+++ b/hardware/README.md
@@ -161,3 +161,11 @@ to export gerber file for PCB manufacturer (and photo preview + overview documen
 make board
 ~~~
 
+fabrication
+===========
+
+the board has components on both sides.
+it is a mix of through hole components (USB connectors, displays, batteries, switches) and surface mount components (the rest, mainly the micro-controller and power related parts).
+the connectors need to be through hole components to withstand the mechanical load when plugin in and removing the cables.
+
+use board with a thickness of maximum 1.2 mm since the USB-C leads are only 1.3 mm long.