diff --git a/boards/ice40hx8k/README.md b/boards/ice40hx8k/README.md
index 86b3268..5051603 100644
--- a/boards/ice40hx8k/README.md
+++ b/boards/ice40hx8k/README.md
@@ -39,6 +39,7 @@ vga_v_sync  - D1 ---------------- VGA PIN 14
 ### PS/2 Cable
 
 ```
+                  270 ohm
 ps2_clk - N3 -----/\/\/\----- PS/2 PIN 5
 ps2_din - N2 -----/\/\/\----- PS/2 PIN 1
          GND ------o--------- PS/2 PIN 3