4 files changed, 6 insertions, 3 deletions
diff --git a/src/Language/GraphQL/AST/Document.hs b/src/Language/GraphQL/AST/Document.hs
index 66fc246..f695495 100644
--- a/src/Language/GraphQL/AST/Document.hs
+++ b/src/Language/GraphQL/AST/Document.hs
@@ -405,7 +405,7 @@ data TypeSystemDefinition
     = SchemaDefinition [Directive] (NonEmpty OperationTypeDefinition)
     | TypeDefinition TypeDefinition
     | DirectiveDefinition
-        Description Name ArgumentsDefinition (NonEmpty DirectiveLocation)
+        Description Name ArgumentsDefinition Bool (NonEmpty DirectiveLocation)
     deriving (Eq, Show)
 
 -- ** Type System Extensions
diff --git a/src/Language/GraphQL/AST/Encoder.hs b/src/Language/GraphQL/AST/Encoder.hs
index 120fb64..afa30de 100644
--- a/src/Language/GraphQL/AST/Encoder.hs
+++ b/src/Language/GraphQL/AST/Encoder.hs
@@ -159,11 +159,12 @@ typeSystemDefinition formatter = \case
             <> optempty (directives formatter) operationDirectives
             <> bracesList formatter (operationTypeDefinition formatter) (NonEmpty.toList operationTypeDefinitions')
     Full.TypeDefinition typeDefinition' -> typeDefinition formatter typeDefinition'
-    Full.DirectiveDefinition description' name' arguments' locations
+    Full.DirectiveDefinition description' name' arguments' repeatable locations
         -> description formatter description'
         <> "@"
         <> Lazy.Text.fromStrict name'
         <> argumentsDefinition formatter arguments'
+        <> (if repeatable then " repeatable" else mempty)
         <> " on"
         <> pipeList formatter (directiveLocation <$> locations)
 
diff --git a/src/Language/GraphQL/AST/Parser.hs b/src/Language/GraphQL/AST/Parser.hs
index 049876e..f325ee7 100644
--- a/src/Language/GraphQL/AST/Parser.hs
+++ b/src/Language/GraphQL/AST/Parser.hs
@@ -27,6 +27,7 @@ import Text.Megaparsec
     , unPos
     , (<?>)
     )
+import Data.Maybe (isJust)
 
 -- | Parser for the GraphQL documents.
 document :: Parser Full.Document
@@ -82,6 +83,7 @@ directiveDefinition description' = Full.DirectiveDefinition description'
     <* at
     <*> name
     <*> argumentsDefinition
+    <*> (isJust <$> optional (symbol "repeatable"))
     <* symbol "on"
     <*> directiveLocations
     <?> "DirectiveDefinition"
diff --git a/src/Language/GraphQL/Validate.hs b/src/Language/GraphQL/Validate.hs
index f6f8788..ba00594 100644
--- a/src/Language/GraphQL/Validate.hs
+++ b/src/Language/GraphQL/Validate.hs
@@ -200,7 +200,7 @@ typeSystemDefinition context rule = \case
         directives context rule schemaLocation directives'
     Full.TypeDefinition typeDefinition' ->
         typeDefinition context rule typeDefinition'
-    Full.DirectiveDefinition _ _ arguments' _ ->
+    Full.DirectiveDefinition _ _ arguments' _ _ ->
         argumentsDefinition context rule arguments'
 
 typeDefinition :: forall m. Validation m -> ApplyRule m Full.TypeDefinition