diff --git a/README.md b/README.md
index 5db85fc..1486651 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,13 @@ Msx Midi Internet Gateway
 
 NOTE: Proof of concept no working code here...
 
+## POI
+
+see source files;
+
+* mmi-fac.asm defines midi interface driver
+* drv-tcpip.asm:26 full macro impl of TCPIP_GET_CAPAB
+
 ## Running
 
 make test-mmidrv