diff --git a/index.d.ts b/index.d.ts
index ff69d56..3d9d051 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -65,9 +65,9 @@ declare namespace tocbot {
     // Options are: "debounce" or "throttle"
     // when set auto , use debounce less than 333ms , other use throttle.
     // for ios browser can't use history.pushState() more than 100 times per 30 seconds reason
-    scrollHandlerType?: "auto" | "debounce" | "throttle" 
+    scrollHandlerType?: "auto" | "debounce" | "throttle"
     //  scrollHandler delay in ms.
-    scrollHandlerTimeout: number
+    scrollHandlerTimeout?: number
     // Timeout between events firing to make sure it's
     // not too rapid (for performance reasons).
     throttleTimeout?: number
@@ -121,7 +121,7 @@ declare namespace tocbot {
     // assuming `disableTocScrollSync` is set to false. This allows for
     // scrolling an outer element (like a nav panel w/ search) containing the toc.
     // Please pass an element, not a selector here.
-    tocScrollingWrapper: null
+    tocScrollingWrapper?: null
     // Offset for the toc scroll (top) position when scrolling the page.
     // Only effective if `disableTocScrollSync` is false.
     tocScrollOffset?: number
diff --git a/package-lock.json b/package-lock.json
index a99fe61..45d8a58 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "tocbot",
-  "version": "4.36.0",
+  "version": "4.36.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "tocbot",
-      "version": "4.36.0",
+      "version": "4.36.1",
       "license": "MIT",
       "devDependencies": {
         "@babel/cli": "^7.19.3",
diff --git a/package.json b/package.json
index a366ae9..00f5e2c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tocbot",
-  "version": "4.36.0",
+  "version": "4.36.1",
   "description": "Generate a table of contents based on the heading structure of a html document.",
   "main": "./dist/tocbot.cjs",
   "module": "./index.js",