diff --git a/types/storybook__addon-knobs/index.d.ts b/types/storybook__addon-knobs/index.d.ts
index 3c9bbe0fc4..4d6eff536f 100644
--- a/types/storybook__addon-knobs/index.d.ts
+++ b/types/storybook__addon-knobs/index.d.ts
@@ -2,6 +2,7 @@
 // Project: https://github.com/storybooks/storybook
 // Definitions by: Joscha Feth <https://github.com/joscha>
 //                 Martynas Kadisa <https://github.com/martynaskadisa>
+//                 A.MacLeay <https://github.com/amacleay>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.6
 
@@ -49,11 +50,11 @@ export function object<T>(name: string, value: T, groupId?: string): T;
 export type SelectValue = string | number;
 export function select<T extends string>(name: string, options: { [s: string]: string }, value: T, groupId?: string): T;
 export function select<T extends number>(name: string, options: { [s: number]: string }, value: T, groupId?: string): T;
-export function select<T extends SelectValue>(name: string, options: T[], value: T, groupId?: string): T;
+export function select<T extends SelectValue>(name: string, options: ReadonlyArray<T>, value: T, groupId?: string): T;
 
 export function date(name: string, value?: Date, groupId?: string): Date;
 
-export function array<T>(name: string, value: T[], separator?: string, groupId?: string): T[];
+export function array<T>(name: string, value: ReadonlyArray<T>, separator?: string, groupId?: string): T[];
 
 export function button(name: string, handler: () => any, groupId?: string): void;
 
diff --git a/types/storybook__addon-knobs/storybook__addon-knobs-tests.tsx b/types/storybook__addon-knobs/storybook__addon-knobs-tests.tsx
index c35268ac6b..ee8f58893c 100644
--- a/types/storybook__addon-knobs/storybook__addon-knobs-tests.tsx
+++ b/types/storybook__addon-knobs/storybook__addon-knobs-tests.tsx
@@ -90,6 +90,14 @@ stories.add('dynamic knobs', () => {
   );
 });
 
+const readonlyOptionsArray: ReadonlyArray<string> = ['hi'];
+select('With readonly array', readonlyOptionsArray, readonlyOptionsArray[0]);
+
+const genericArray = array('With regular array', ['hi', 'there']);
+
+const userInputArray = array('With readonly array', readonlyOptionsArray);
+userInputArray.push('Make sure that the output is still mutable although the input need not be!');
+
 // groups
 const groupId = 'GROUP-ID1';