diff --git a/types/index.d.ts b/types/index.d.ts
index c070869..20d5b43 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -59,6 +59,7 @@ declare class MockAdapter {
   onDelete: RequestMatcherFunc;
   onPatch: RequestMatcherFunc;
   onList: RequestMatcherFunc;
+  onOptions: RequestMatcherFunc;
   onAny: RequestMatcherFunc;
 }