diff --git a/spec/Appendix B -- Grammar Summary.md b/spec/Appendix B -- Grammar Summary.md
index 6299a7718..483bf0ae9 100644
--- a/spec/Appendix B -- Grammar Summary.md	
+++ b/spec/Appendix B -- Grammar Summary.md	
@@ -200,7 +200,7 @@ SchemaExtension :
   - extend schema Directives[Const]? { OperationTypeDefinition+ }
   - extend schema Directives[Const]
 
-OperationTypeDefinition : OperationType : NamedType
+RootOperationTypeDefinition : OperationType : NamedType
 
 Description : StringValue
 
diff --git a/spec/Section 3 -- Type System.md b/spec/Section 3 -- Type System.md
index 9677a17f4..f6fe26844 100644
--- a/spec/Section 3 -- Type System.md	
+++ b/spec/Section 3 -- Type System.md	
@@ -153,7 +153,7 @@ type Query {
 ### Schema Extension
 
 SchemaExtension :
-  - extend schema Directives[Const]? { OperationTypeDefinition+ }
+  - extend schema Directives[Const]? { RootOperationTypeDefinition+ }
   - extend schema Directives[Const]
 
 Schema extensions are used to represent a schema which has been extended from