diff --git a/types/inquirer/index.d.ts b/types/inquirer/index.d.ts
index 4fc2ca4ce0..e2e897741d 100644
--- a/types/inquirer/index.d.ts
+++ b/types/inquirer/index.d.ts
@@ -5,6 +5,7 @@
 //                 Jouderian <https://github.com/jouderianjr>
 //                 Qibang <https://github.com/bang88>
 //                 Jason Dreyzehner <https://github.com/bitjson>
+//                 Synarque <https://github.com/synarque>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 // TypeScript Version: 2.3
@@ -90,7 +91,7 @@ declare namespace inquirer {
          * Default value(s) to use if nothing is entered, or a function that returns the default value(s).
          * If defined as a function, the first parameter will be the current inquirer session answers.
          */
-        default?: any | ((answers: T) => any);
+        default?: any | ((answers: T) => any) | ((answers: T) => Promise<any>);
         /**
          * Choices array or a function returning a choices array. If defined as a function,
          * the first parameter will be the current inquirer session answers.
@@ -99,22 +100,23 @@ declare namespace inquirer {
          */
         choices?:
             | ReadonlyArray<ChoiceType>
-            | ((answers: T) => ReadonlyArray<ChoiceType>);
+            | ((answers: T) => ReadonlyArray<ChoiceType>)
+            | ((answers: T) => Promise<ReadonlyArray<ChoiceType>>);
         /**
          * Receive the user input and should return true if the value is valid, and an error message (String)
          * otherwise. If false is returned, a default error message is provided.
          */
-        validate?(input: string, answers?: T): boolean | string;
+        validate?(input: string, answers?: T): boolean | string | Promise<boolean | string>;
         /**
          * Receive the user input and return the filtered value to be used inside the program.
          * The value returned will be added to the Answers hash.
          */
-        filter?(input: string): string;
+        filter?(input: string): string | Promise<string>;
         /**
          * Receive the current user answers hash and should return true or false depending on whether or
          * not this question should be asked. The value can also be a simple boolean.
          */
-        when?: boolean | ((answers: T) => boolean);
+        when?: boolean | ((answers: T) => boolean) | ((answers: T) => Promise<boolean>);
         paginated?: boolean;
         /**
          * Change the number of lines that will be rendered when using list, rawList, expand or checkbox.