diff --git a/working/augmentations/feature-specification.md b/working/augmentations/feature-specification.md
index 74289e33ea..8befb16f33 100644
--- a/working/augmentations/feature-specification.md
+++ b/working/augmentations/feature-specification.md
@@ -173,7 +173,7 @@ extensionTypeDeclaration ::=
     'extension' 'type' 'const'? typeIdentifier
     typeParameters? representationDeclaration interfaces?
     memberedDeclarationBody
-  | 'augment' 'extension' 'type' 'const'? typeIdentifier
+  | 'augment' 'extension' 'type' typeIdentifier
     typeParameters? interfaces?
     memberedDeclarationBody