diff --git a/appveyor.yml b/appveyor.yml
index b4bd3e1a..60e0f74d 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 5.0.1.{build}
+version: 5.1.0.{build}
 pull_requests:
   do_not_increment_build_number: true
 skip_tags: true
diff --git a/package.json b/package.json
index e719dbcc..b639ca3a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "graphql-parser",
-  "version": "5.0.1",
+  "version": "5.1.0",
   "main": "index.js",
   "repository": "git@github.com:graphql-dotnet/parser.git",
   "author": "Joe McBride",
diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index b434530f..714a5af9 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -1,10 +1,10 @@
 <Project>
   
   <PropertyGroup>
-    <VersionPrefix>5.0.1</VersionPrefix>
+    <VersionPrefix>5.1.0</VersionPrefix>
     <Authors>Marek Magdziak</Authors>
     <NoWarn>$(NoWarn);1591</NoWarn>
-    <Copyright>Copyright 2016-2019 Marek Magdziak et al. All rights reserved.</Copyright>
+    <Copyright>Copyright 2016-2020 Marek Magdziak et al. All rights reserved.</Copyright>
     <GenerateAssemblyInfo>true</GenerateAssemblyInfo>
     <LangVersion>latest</LangVersion>
   </PropertyGroup>
diff --git a/src/GraphQLParser.Tests/ParserTests.cs b/src/GraphQLParser.Tests/ParserTests.cs
index 472f4779..27f736cb 100644
--- a/src/GraphQLParser.Tests/ParserTests.cs
+++ b/src/GraphQLParser.Tests/ParserTests.cs
@@ -395,22 +395,39 @@ private static GraphQLDocument ParseGraphQLFieldWithOperationTypeAndNameSource()
         }
 
         [Theory]
-        [InlineData("directive @dir on FIELD_DEFINITION | ENUM_VALUE")]
-        [InlineData("directive @dir on | FIELD_DEFINITION | ENUM_VALUE")]
+        [InlineData("directive @dir repeatable on FIELD_DEFINITION", true)]
+        [InlineData("directive @dir(a: Int) repeatable on FIELD_DEFINITION", true)]
+        [InlineData("directive @dir on FIELD_DEFINITION | ENUM_VALUE", false)]
+        [InlineData("directive @dir on | FIELD_DEFINITION | ENUM_VALUE", false)]
         [InlineData(@"directive @dir on
-FIELD_DEFINITION | ENUM_VALUE")]
+FIELD_DEFINITION | ENUM_VALUE", false)]
         [InlineData(@"directive @dir on
 FIELD_DEFINITION
-| ENUM_VALUE")]
+| ENUM_VALUE", false)]
         [InlineData(@"directive @dir on
 | FIELD_DEFINITION
-| ENUM_VALUE")]
+| ENUM_VALUE", false)]
         [InlineData(@"directive @dir on   
 |  FIELD_DEFINITION
-|          ENUM_VALUE")]
-        public void Should_Parse_Directives(string text)
+|          ENUM_VALUE", false)]
+        public void Should_Parse_Directives(string text, bool repeatable)
         {
-            new Parser(new Lexer()).Parse(new Source(text)).ShouldNotBeNull();
+            var document = new Parser(new Lexer()).Parse(new Source(text));
+            document.ShouldNotBeNull();
+            document.Definitions.Count.ShouldBe(1);
+            document.Definitions[0].ShouldBeOfType<GraphQLDirectiveDefinition>().Repeatable.ShouldBe(repeatable);
+        }
+
+        [Theory]
+        [InlineData("directive @dir On FIELD_DEFINITION")]
+        [InlineData("directive @dir onn FIELD_DEFINITION")]
+        [InlineData("directive @dir Repeatable on FIELD_DEFINITION")]
+        [InlineData("directive @dir repeatablee on FIELD_DEFINITION")]
+        [InlineData("directive @dir repeatable On FIELD_DEFINITION")]
+        [InlineData("directive @dir repeatable onn FIELD_DEFINITION")]
+        public void Should_Throw_GraphQLSyntaxErrorException(string text)
+        {
+            Should.Throw<GraphQLSyntaxErrorException>(() => new Parser(new Lexer()).Parse(new Source(text)));
         }
 
         [Theory]
diff --git a/src/GraphQLParser/AST/GraphQLDirectiveDefinition.cs b/src/GraphQLParser/AST/GraphQLDirectiveDefinition.cs
index 3396c34d..e7d7150a 100644
--- a/src/GraphQLParser/AST/GraphQLDirectiveDefinition.cs
+++ b/src/GraphQLParser/AST/GraphQLDirectiveDefinition.cs
@@ -11,5 +11,7 @@ public class GraphQLDirectiveDefinition : GraphQLTypeDefinition
         public override ASTNodeKind Kind => ASTNodeKind.DirectiveDefinition;
 
         public List<GraphQLName> Locations { get; set; }
+
+        public bool Repeatable { get; set; }
     }
 }
\ No newline at end of file
diff --git a/src/GraphQLParser/ParserContext.cs b/src/GraphQLParser/ParserContext.cs
index 3b2c989d..4603b5ba 100644
--- a/src/GraphQLParser/ParserContext.cs
+++ b/src/GraphQLParser/ParserContext.cs
@@ -347,8 +347,14 @@ private GraphQLDirective ParseDirective()
                 Arguments = ParseArguments(),
                 Location = GetLocation(start)
             };
-        }
-
+        }
+
+        /// <summary>
+        /// http://spec.graphql.org/draft/#DirectiveDefinition
+        /// DirectiveDefinition:
+        ///     Description(opt) directive @ Name ArgumentsDefinition(opt) repeatable(opt) on DirectiveLocations
+        /// </summary>
+        /// <returns></returns>
         private GraphQLDirectiveDefinition ParseDirectiveDefinition()
         {
             var comment = GetComment();
@@ -358,6 +364,7 @@ private GraphQLDirectiveDefinition ParseDirectiveDefinition()
 
             var name = ParseName();
             var args = ParseArgumentDefs();
+            var repeatable = ParseRepeatable();
 
             ExpectKeyword("on");
             var locations = ParseDirectiveLocations();
@@ -366,10 +373,30 @@ private GraphQLDirectiveDefinition ParseDirectiveDefinition()
             {
                 Comment = comment,
                 Name = name,
+                Repeatable = repeatable,
                 Arguments = args,
                 Locations = locations,
                 Location = GetLocation(start)
             };
+        }
+
+        private bool ParseRepeatable()
+        {
+            if (Peek(TokenKind.NAME))
+            {
+                switch (currentToken.Value)
+                {
+                    case "repeatable":
+                        Advance();
+                        return true;
+                    case "on":
+                        return false;
+                    default:
+                        throw new GraphQLSyntaxErrorException($"Unexpected {currentToken}", source, currentToken.Start);
+                }
+            }
+
+            return false;
         }
 
         private List<GraphQLName> ParseDirectiveLocations()