diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 8431269046c..36dfc836dac 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -685,7 +685,7 @@ namespace ts {
         kind: SyntaxKind.Parameter;
         parent?: SignatureDeclaration;
         dotDotDotToken?: DotDotDotToken;    // Present on rest parameter
-        name?: BindingName;                 // Declared parameter name. Missing if this is a parameter in a JSDocFunctionType.
+        name: BindingName;                  // Declared parameter name.
         questionToken?: QuestionToken;      // Present on optional parameter
         type?: TypeNode;                    // Optional type annotation
         initializer?: Expression;           // Optional initializer