diff --git a/types/storybook__addon-options/index.d.ts b/types/storybook__addon-options/index.d.ts
index b60230784b0073f..2638cdab8d80eed 100644
--- a/types/storybook__addon-options/index.d.ts
+++ b/types/storybook__addon-options/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for @storybook/addon-options 3.0
+// Type definitions for @storybook/addon-options 3.2
 // Project: https://github.com/storybooks/storybook
 // Definitions by: Joscha Feth <https://github.com/joscha>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
@@ -13,6 +13,7 @@ export interface Options {
     showSearchBox?: boolean;
     downPanelInRight?: boolean;
     sortStoriesByKind?: boolean;
+    hierarchySeparator?: RegExp | string;
 }
 
 export function setOptions(options: Options): void;
diff --git a/types/storybook__addon-options/storybook__addon-options-tests.ts b/types/storybook__addon-options/storybook__addon-options-tests.ts
index c4a53edf057ffe4..b88cf0504faa889 100644
--- a/types/storybook__addon-options/storybook__addon-options-tests.ts
+++ b/types/storybook__addon-options/storybook__addon-options-tests.ts
@@ -9,4 +9,9 @@ setOptions({
   showSearchBox: false,
   downPanelInRight: false,
   sortStoriesByKind: false,
+  hierarchySeparator: /\//,
+});
+
+setOptions({
+  hierarchySeparator: '.',
 });