diff --git a/README.md b/README.md
index 79789bb..20439ed 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,10 @@ https://github.com/rusefi/rusefi/wiki/Mazda-Miata-2003
 For photos see https://github.com/rusefi/rusefi/wiki/Hellen72
 
 
-Compatible cases:
+# Compatible cases
 
-89661-3T270
\ No newline at end of file
+89661-3T270
+
+# Hardware
+
+M4 x 10mm will be good for NB external case and internal board to case for both NA and NB.