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diff --git a/src/Language/GraphQL/AST/DirectiveLocation.hs b/src/Language/GraphQL/AST/DirectiveLocation.hs
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+++ b/src/Language/GraphQL/AST/DirectiveLocation.hs
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+-- | Various parts of a GraphQL document can be annotated with directives. 
+--   This module describes locations in a document where directives can appear.
+module Language.GraphQL.AST.DirectiveLocation
+    ( DirectiveLocation(..)
+    , ExecutableDirectiveLocation(..)
+    , TypeSystemDirectiveLocation(..)
+    ) where
+
+-- | All directives can be splitted in two groups: directives used to annotate
+--   various parts of executable definitions and the ones used in the schema
+--   definition.
+data DirectiveLocation
+    = ExecutableDirectiveLocation ExecutableDirectiveLocation
+    | TypeSystemDirectiveLocation TypeSystemDirectiveLocation
+    deriving (Eq, Show)
+
+-- | Where directives can appear in an executable definition, like a query.
+data ExecutableDirectiveLocation
+    = Query
+    | Mutation
+    | Subscription
+    | Field
+    | FragmentDefinition
+    | FragmentSpread
+    | InlineFragment
+    deriving (Eq, Show)
+
+-- | Where directives can appear in a type system definition.
+data TypeSystemDirectiveLocation
+    = Schema
+    | Scalar
+    | Object
+    | FieldDefinition
+    | ArgumentDefinition
+    | Interface
+    | Union
+    | Enum
+    | EnumValue
+    | InputObject
+    | InputFieldDefinition
+    deriving (Eq, Show)