diff --git a/src/types.ts b/src/types.ts
index 913e5dd..323cfe0 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -21,6 +21,7 @@ interface ModuleReplacementLike {
 export interface DocumentedModuleReplacement extends ModuleReplacementLike {
   type: 'documented';
   url: KnownUrl;
+  description?: never;
   replacementModule: string;
 }