diff --git a/graphql_schema/lib/src/scalar.dart b/graphql_schema/lib/src/scalar.dart
index 2d5941fb..5dd0d1b2 100644
--- a/graphql_schema/lib/src/scalar.dart
+++ b/graphql_schema/lib/src/scalar.dart
@@ -10,7 +10,7 @@ final GraphQLScalarType<String, String> graphQLString =
 /// The ID scalar type represents a unique identifier, often used to refetch an object or as the key for a cache.
 ///
 /// The ID type is serialized in the same way as a String; however, defining it as an ID signifies that it is not intended to be human‐readable.
-final GraphQLScalarType<String, String> graphQLId = new _GraphQLStringType._();
+final GraphQLScalarType<String, String> graphQLId = new _GraphQLStringType._('ID');
 
 /// A [DateTime].
 final GraphQLScalarType<DateTime, String> graphQLDate =
@@ -91,10 +91,9 @@ class _GraphQLNumType<T extends num> extends GraphQLScalarType<T, T> {
 }
 
 class _GraphQLStringType extends GraphQLScalarType<String, String> {
-  _GraphQLStringType._();
+  final String name;
 
-  @override
-  String get name => 'String';
+  _GraphQLStringType._([this.name = 'String']);
 
   @override
   String get description => 'A character sequence.';
diff --git a/graphql_schema/lib/src/schema.dart b/graphql_schema/lib/src/schema.dart
index 3fcc7a52..5c61a3b7 100644
--- a/graphql_schema/lib/src/schema.dart
+++ b/graphql_schema/lib/src/schema.dart
@@ -100,10 +100,14 @@ class GraphExceptionErrorLocation {
   }
 }
 
+typedef GraphQLType _GraphDocumentationTypeProvider();
+
 /// A metadata annotation used to provide documentation to `package:graphql_server`.
 class GraphQLDocumentation {
   final String description;
   final String deprecationReason;
+  final _GraphDocumentationTypeProvider type;
 
-  const GraphQLDocumentation({this.description, this.deprecationReason});
+  const GraphQLDocumentation(
+      {this.description, this.deprecationReason, GraphQLType this.type()});
 }
diff --git a/graphql_server/lib/mirrors.dart b/graphql_server/lib/mirrors.dart
index 21bfb2be..8f8771b3 100644
--- a/graphql_server/lib/mirrors.dart
+++ b/graphql_server/lib/mirrors.dart
@@ -151,13 +151,18 @@ GraphQLEnumType enumTypeFromClassMirror(ClassMirror mirror) {
 
 GraphQLField fieldFromGetter(
     Symbol name, MethodMirror mirror, Exclude exclude, ClassMirror clazz) {
-  var type = convertDartType(mirror.returnType.reflectedType,
-      mirror.returnType.typeArguments.map((t) => t.reflectedType).toList());
+  var type = _getProvidedType(mirror.metadata);
+  var wasProvided = type != null;
+
+  if (!wasProvided) {
+    type = convertDartType(mirror.returnType.reflectedType,
+        mirror.returnType.typeArguments.map((t) => t.reflectedType).toList());
+  }
 
   var nameString = _getSerializedName(name, mirror, clazz);
   var defaultValue = _getDefaultValue(mirror);
 
-  if (nameString == 'id' && _autoNames(clazz)) {
+  if (!wasProvided && (nameString == 'id' && _autoNames(clazz))) {
     type = graphQLId;
   }
 
@@ -262,3 +267,13 @@ String _getDescription(List<InstanceMirror> metadata) {
 
   return null;
 }
+
+GraphQLType _getProvidedType(List<InstanceMirror> metadata) {
+  for (var obj in metadata) {
+    if (obj.reflectee is GraphQLDocumentation) {
+      return (obj.reflectee as GraphQLDocumentation).type();
+    }
+  }
+
+  return null;
+}