diff --git a/types/react-select/lib/Async.d.ts b/types/react-select/lib/Async.d.ts
index 8acc5532b7..b9c753fa92 100644
--- a/types/react-select/lib/Async.d.ts
+++ b/types/react-select/lib/Async.d.ts
@@ -6,14 +6,16 @@ import { OptionsType, InputActionMeta } from './types';
 
 export interface AsyncProps<OptionType> {
   /* The default set of options to show before the user starts searching. When
-     set to `true`, the results for loadOptions('') will be autoloaded. */
-  defaultOptions: OptionsType<OptionType> | boolean;
+     set to `true`, the results for loadOptions('') will be autoloaded.
+     Default: false. */
+  defaultOptions?: OptionsType<OptionType> | boolean;
   /* Function that returns a promise, which is the set of options to be used
      once the promise resolves. */
   loadOptions: (inputValue: string, callback: ((options: OptionsType<OptionType>) => void)) => Promise<any> | void;
   /* If cacheOptions is truthy, then the loaded data will be cached. The cache
-     will remain until `cacheOptions` changes value. */
-  cacheOptions: any;
+     will remain until `cacheOptions` changes value.
+     Default: false. */
+  cacheOptions?: any;
 }
 
 export type Props<OptionType> = SelectProps<OptionType> & AsyncProps<OptionType>;