diff --git a/PiSCSI-Control-Board.md b/PiSCSI-Control-Board.md
index 1e2365d..ac21ed6 100644
--- a/PiSCSI-Control-Board.md
+++ b/PiSCSI-Control-Board.md
@@ -77,6 +77,7 @@ The URLs provided are just examples.
 Additional notes for the assembly.
 * For variant 2, JP4 needs to be solder-bridged.
 * For the PiSCSI control board hat to sit tight and stable, it's useful (or let's rather say essential) to install four M2.5 spacers between the PiSCSI hat and the control board hat.
+* Newer PiSCSI boards have 6 pins on the J4 "Oled" connector. These will mate up with the 6 pin connector of the control board. Older PiSCSI boards only have 5 pins on J4. These will also need to use "GPIO9" from connector J5.
 
 # Hardware Installation