diff --git a/sega/identifiers.md b/sega/identifiers.md
index 6e57edb..1f4472e 100644
--- a/sega/identifiers.md
+++ b/sega/identifiers.md
@@ -322,7 +322,7 @@ Example:
 
 ## Game ID
 
-Seems to have been introduced around the start of ALL.NET and used from at least the Lindbergh onwards, possibly earlier.
+Seems to have been introduced around the start of ALL.NET and used from Naomi 2/Atomiswave onwards.
 
 Format: `S[BD][A-Z]{2}`. `SC**` may be developer IDs?
 
@@ -332,6 +332,8 @@ Examples:
 
 Seem to be allocated (semi-)sequentially and roll over when `Z` is reached.
 
+Very early ALL.NET games (Such as VF4 and VF4 Evolution) do not include the S in their game ID.
+
 ## Media ID
 
 Seems to have been introduced around the NAOMI launch.