diff --git a/spin/spin.d.ts b/spin/spin.d.ts
index 88a45943a..c7ceac2b6 100644
--- a/spin/spin.d.ts
+++ b/spin/spin.d.ts
@@ -41,6 +41,6 @@ declare class Spinner {
      * Stopped spinners may be reused by calling spin() again.
      */
     stop(): Spinner;
-    lines(el, o);
-    opacity(el, i, val);
+    lines(el:HTMLElement, o:SpinnerOptions):HTMLElement;
+    opacity(el:HTMLElement, i:number, val:number, o:SpinnerOptions):void;
 }