diff --git a/docs/pokerth.asn1 b/docs/pokerth.asn1
index 0382ce70..16fbc039 100644
--- a/docs/pokerth.asn1
+++ b/docs/pokerth.asn1
@@ -592,7 +592,7 @@ NonZeroId ::= INTEGER(1..4294967295)
 
 Id ::= INTEGER(0..4294967295)
 
-Guid ::= INTEGER(1..4294967295) -- TODO
+Guid ::= INTEGER(0..4294967295) -- TODO
 
 Card ::= INTEGER(0..51)