diff --git a/index.d.ts b/index.d.ts
index 7ccd295..bec5271 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -68,7 +68,7 @@ interface ToBinaryResult {
 declare class WasmModule {
   constructor(module_addr: number);
   /** Validates the module. Throws if not valid. */
-  validate(): void;
+  validate(options?: WasmFeatures): void;
   /** Resolves names to indexes. */
   resolveNames(): void;
   /** Generates textual names for function types, globals, labels etc. */