1 files changed, 4 insertions, 0 deletions
diff --git a/README.md b/README.md
index 4814622..873fcc9 100644
--- a/README.md
+++ b/README.md
@@ -239,5 +239,9 @@ initialization code located in the ROM.
 - `MROD`: `0x12`
 - `MROQ`: `0x13`
 
+### Register encoding identifiers
+
+- `X0 - X15`: `0x00 - 0x0E`
+
 Copyright (c) 2024 Quinn Stephens and Ian Marco Moffett.
 All rights reserved.