diff --git a/pages/04.appendix/01.address-encoding/docs.md b/pages/04.appendix/01.address-encoding/docs.md
index 9513e0d..cef05c2 100644
--- a/pages/04.appendix/01.address-encoding/docs.md
+++ b/pages/04.appendix/01.address-encoding/docs.md
@@ -17,7 +17,7 @@ M17 uses 48-bit (6-byte) addresses. Callsigns and special purpose addresses are
Table 1 M17 Addresses
Address Range (base-16) | Category | Number of Addresses | Remarks
------------- | -------- | ------------------- | -------
-0x000000000000 | RESERVED | 1 | For future use
+0x000000000000 | INVALID | 1 |
0x000000000001 - 0xEE6B27FFFFFF | Unit ID | 262143999999999 |
0xEE6B28000000 - 0xFFFFFFFFFFFE | RESERVED | 19330976710655 | For future use
0xFFFFFFFFFFFF | Broadcast | 1 | Valid only for destination