diff --git a/src/rgbds.5 b/src/rgbds.5
index 03ef6407..0114138f 100644
--- a/src/rgbds.5
+++ b/src/rgbds.5
@@ -33,7 +33,8 @@ is a 0‐terminated string of
 .Bd -literal
 ; Header
 
-BYTE    ID[4]            ; "RGB7"
+BYTE    ID[4]            ; "RGB9"
+LONG    RevisionNumber   ; The format's revision number this file uses
 LONG    NumberOfSymbols  ; The number of symbols used in this file
 LONG    NumberOfSections ; The number of sections used in this file