diff --git a/spec/Appendix B -- Grammar Summary.md b/spec/Appendix B -- Grammar Summary.md
index 01c900a3f..7886b1741 100644
--- a/spec/Appendix B -- Grammar Summary.md	
+++ b/spec/Appendix B -- Grammar Summary.md	
@@ -320,7 +320,7 @@ InputObjectTypeExtension :
   - extend input Name Directives[Const]? InputFieldsDefinition
   - extend input Name Directives[Const] [lookahead != `{`]
 
-DirectiveDefinition : Description? directive @ Name ArgumentsDefinition? `repeatable`? on DirectiveLocations
+DirectiveDefinition : Description? directive @ Name ArgumentsDefinition? `repeatable`? on DirectiveLocations Directives?
 
 DirectiveLocations :
   - DirectiveLocations | DirectiveLocation
@@ -352,3 +352,4 @@ TypeSystemDirectiveLocation : one of
   - `ENUM_VALUE`
   - `INPUT_OBJECT`
   - `INPUT_FIELD_DEFINITION`
+  - `DIRECTIVE_DEFINITION`
diff --git a/spec/Section 3 -- Type System.md b/spec/Section 3 -- Type System.md
index d164550cc..e230b303d 100644
--- a/spec/Section 3 -- Type System.md	
+++ b/spec/Section 3 -- Type System.md	
@@ -1838,7 +1838,7 @@ Expected Type | Internal Value   | Coerced Result
 
 ## Directives
 
-DirectiveDefinition : Description? directive @ Name ArgumentsDefinition? `repeatable`? on DirectiveLocations
+DirectiveDefinition : Description? directive @ Name ArgumentsDefinition? `repeatable`? on DirectiveLocations Directives?
 
 DirectiveLocations :
   - DirectiveLocations | DirectiveLocation
@@ -1870,6 +1870,7 @@ TypeSystemDirectiveLocation : one of
   - `ENUM_VALUE`
   - `INPUT_OBJECT`
   - `INPUT_FIELD_DEFINITION`
+  - `DIRECTIVE_DEFINITION`
 
 A GraphQL schema describes directives which are used to annotate various parts
 of a GraphQL document as an indicator that they should be evaluated differently
diff --git a/spec/Section 4 -- Introspection.md b/spec/Section 4 -- Introspection.md
index 9adb20b94..1fa05a317 100644
--- a/spec/Section 4 -- Introspection.md	
+++ b/spec/Section 4 -- Introspection.md	
@@ -214,6 +214,7 @@ enum __DirectiveLocation {
   ENUM_VALUE
   INPUT_OBJECT
   INPUT_FIELD_DEFINITION
+  DIRECTIVE_DEFINITION
 }
 ```