diff --git a/README.md b/README.md
index 3dbaf90..903097a 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,12 @@ just using the VP230 for differential signaling.
 * Schematic of STM32 <-> VP230 (CAN Bus)
 * Verified STM32 read protection is in place :(
 
+# Bus Splitter
+The `bus_splitter` directory contains a KiCAD project to attempt reverse engineering the protocol
+'monkey-in-the-middle' style. It contains two CAN bus transceivers, with the UART in between them
+being passed to a set of header pins. The idea being the RX/TX pins can be attached to an
+external microcontroller, allowing message to be inspected, modified and/or passed through as is.
+
 # Further Reading
 
 https://www.eevblog.com/forum/manufacture/neoden-tm245p-teardown-and-upgrade/