diff --git a/graphql_parser/lib/src/language/ast/boolean_value.dart b/graphql_parser/lib/src/language/ast/boolean_value.dart
index 62b78046..423f0cde 100644
--- a/graphql_parser/lib/src/language/ast/boolean_value.dart
+++ b/graphql_parser/lib/src/language/ast/boolean_value.dart
@@ -2,18 +2,26 @@ import 'package:source_span/source_span.dart';
 import 'input_value.dart';
 import '../token.dart';
 
+/// A GraphQL boolean value literal.
 class BooleanValueContext extends InputValueContext<bool> {
   bool _valueCache;
-  final Token BOOLEAN;
 
-  BooleanValueContext(this.BOOLEAN) {
-    assert(BOOLEAN?.text == 'true' || BOOLEAN?.text == 'false');
+  /// The source token.
+  final Token boolean;
+
+  BooleanValueContext(this.boolean) {
+    assert(boolean?.text == 'true' || boolean?.text == 'false');
   }
 
-  bool get booleanValue => _valueCache ??= BOOLEAN.text == 'true';
+  /// The [bool] value of this literal.
+  bool get booleanValue => _valueCache ??= boolean.text == 'true';
+
+  /// Use [boolean] instead.
+  @deprecated
+  Token get BOOLEAN => boolean;
 
   @override
-  FileSpan get span => BOOLEAN.span;
+  FileSpan get span => boolean.span;
 
   @override
   bool computeValue(Map<String, dynamic> variables) => booleanValue;