diff --git a/json/reflect.go b/json/reflect.go
index 3a5c6f1..6edd80e 100644
--- a/json/reflect.go
+++ b/json/reflect.go
@@ -1,5 +1,5 @@
-//go:build go1.18
-// +build go1.18
+//go:build go1.20
+// +build go1.20
 
 package json
 
diff --git a/json/reflect_optimize.go b/json/reflect_optimize.go
index 6936cef..6588433 100644
--- a/json/reflect_optimize.go
+++ b/json/reflect_optimize.go
@@ -1,5 +1,5 @@
-//go:build !go1.18
-// +build !go1.18
+//go:build !go1.20
+// +build !go1.20
 
 package json
 
diff --git a/json/token.go b/json/token.go
index 652e36d..b9f46ae 100644
--- a/json/token.go
+++ b/json/token.go
@@ -302,6 +302,11 @@ func (t *Tokenizer) String() []byte {
 	return s
 }
 
+// Remaining returns the number of bytes left to parse.
+func (t *Tokenizer) Remaining() int {
+	return len(t.json)
+}
+
 // RawValue represents a raw json value, it is intended to carry null, true,
 // false, number, and string values only.
 type RawValue []byte