diff --git a/types/storybook__addon-info/index.d.ts b/types/storybook__addon-info/index.d.ts
index c616933b8f..ebef2fed73 100644
--- a/types/storybook__addon-info/index.d.ts
+++ b/types/storybook__addon-info/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for @storybook/addon-info 3.2
+// Type definitions for @storybook/addon-info 3.4
 // Project: https://github.com/storybooks/storybook
 // Definitions by: Mark Kornblum <https://github.com/mkornblum>
 //                 Mattias Wikstrom <https://github.com/fyrkant>
@@ -29,6 +29,6 @@ export interface Options {
   maxPropStringLength?: number;
 }
 
-export function withInfo(textOrOptions: string | Options): (storyFn: RenderFunction) => (context?: object) => React.ReactElement<WrapStoryProps>;
+export function withInfo(textOrOptions?: string | Options): (storyFn: RenderFunction) => (context?: object) => React.ReactElement<WrapStoryProps>;
 
 export function setDefaults(newDefaults: Options): Options;
diff --git a/types/storybook__addon-info/storybook__addon-info-tests.tsx b/types/storybook__addon-info/storybook__addon-info-tests.tsx
index b51a48c4cc..46fd799314 100644
--- a/types/storybook__addon-info/storybook__addon-info-tests.tsx
+++ b/types/storybook__addon-info/storybook__addon-info-tests.tsx
@@ -12,6 +12,11 @@ setDefaults({
 });
 
 storiesOf('Component', module)
+  .add('no info',
+       withInfo()(() =>
+         <Component>Click the "?" mark at top-right to view the info.</Component>
+       )
+  )
   .add('simple info',
        withInfo('doc string about my component')(() =>
          <Component>Click the "?" mark at top-right to view the info.</Component>