diff --git a/src/structures/ApplicationCommand.js b/src/structures/ApplicationCommand.js
index 778df2f9deeb..c255cff39c3e 100644
--- a/src/structures/ApplicationCommand.js
+++ b/src/structures/ApplicationCommand.js
@@ -226,6 +226,10 @@ class ApplicationCommand extends Base {
    * the allowed types of channels that can be selected
    * @property {number} [minValue] The minimum value for an `INTEGER` or `NUMBER` option
    * @property {number} [maxValue] The maximum value for an `INTEGER` or `NUMBER` option
+   * @property {number} [minLength] The minimum length for a `STRING` option
+   * (maximum of `6000`)
+   * @property {number} [maxLength] The maximum length for a `STRING` option
+   * (maximum of `6000`)
    */
 
   /**
@@ -454,7 +458,9 @@ class ApplicationCommand extends Base {
       option.options?.length !== existing.options?.length ||
       (option.channelTypes ?? option.channel_types)?.length !== existing.channelTypes?.length ||
       (option.minValue ?? option.min_value) !== existing.minValue ||
-      (option.maxValue ?? option.max_value) !== existing.maxValue
+      (option.maxValue ?? option.max_value) !== existing.maxValue ||
+      (option.minLength ?? option.min_length) !== existing.minLength ||
+      (option.maxLength ?? option.max_length) !== existing.maxLength
     ) {
       return false;
     }
@@ -510,6 +516,10 @@ class ApplicationCommand extends Base {
    * the allowed types of channels that can be selected
    * @property {number} [minValue] The minimum value for an `INTEGER` or `NUMBER` option
    * @property {number} [maxValue] The maximum value for an `INTEGER` or `NUMBER` option
+   * @property {number} [minLength] The minimum length for a `STRING` option
+   * (maximum of `6000`)
+   * @property {number} [maxLength] The maximum length for a `STRING` option
+   * (maximum of `6000`)
    */
 
   /**
@@ -533,6 +543,8 @@ class ApplicationCommand extends Base {
     const channelTypesKey = received ? 'channelTypes' : 'channel_types';
     const minValueKey = received ? 'minValue' : 'min_value';
     const maxValueKey = received ? 'maxValue' : 'max_value';
+    const minLengthKey = received ? 'minLength' : 'min_length';
+    const maxLengthKey = received ? 'maxLength' : 'max_length';
     const nameLocalizationsKey = received ? 'nameLocalizations' : 'name_localizations';
     const nameLocalizedKey = received ? 'nameLocalized' : 'name_localized';
     const descriptionLocalizationsKey = received ? 'descriptionLocalizations' : 'description_localizations';
@@ -562,6 +574,8 @@ class ApplicationCommand extends Base {
           option.channel_types,
       [minValueKey]: option.minValue ?? option.min_value,
       [maxValueKey]: option.maxValue ?? option.max_value,
+      [minLengthKey]: option.minLength ?? option.min_length,
+      [maxLengthKey]: option.maxLength ?? option.max_length,
     };
   }
 }
diff --git a/typings/index.d.ts b/typings/index.d.ts
index e5e9293930cf..ad64432cf65c 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -3877,7 +3877,7 @@ export interface ApplicationCommandChoicesData extends Omit<BaseApplicationComma
 }
 
 export interface ApplicationCommandChoicesOption extends Omit<BaseApplicationCommandOptionsData, 'autocomplete'> {
-  type: Exclude<CommandOptionChoiceResolvableType, ApplicationCommandOptionTypes>;
+  type: CommandOptionChoiceResolvableType;
   choices?: ApplicationCommandOptionChoiceData[];
   autocomplete?: false;
 }
@@ -3890,12 +3890,26 @@ export interface ApplicationCommandNumericOptionData extends ApplicationCommandC
   max_value?: number;
 }
 
+export interface ApplicationCommandStringOptionData extends ApplicationCommandChoicesData {
+  type: ApplicationCommandOptionTypes.STRING;
+  minLength?: number;
+  min_length?: number;
+  maxLength?: number;
+  max_length?: number;
+}
+
 export interface ApplicationCommandNumericOption extends ApplicationCommandChoicesOption {
-  type: Exclude<CommandOptionNumericResolvableType, ApplicationCommandOptionTypes>;
+  type: CommandOptionNumericResolvableType;
   minValue?: number;
   maxValue?: number;
 }
 
+export interface ApplicationCommandStringOption extends ApplicationCommandChoicesOption {
+  type: ApplicationCommandOptionTypes.STRING;
+  minLength?: number;
+  maxLength?: number;
+}
+
 export interface ApplicationCommandSubGroupData extends Omit<BaseApplicationCommandOptionsData, 'required'> {
   type: 'SUB_COMMAND_GROUP' | ApplicationCommandOptionTypes.SUB_COMMAND_GROUP;
   options?: ApplicationCommandSubCommandData[];
@@ -3914,6 +3928,7 @@ export interface ApplicationCommandSubCommandData extends Omit<BaseApplicationCo
     | ApplicationCommandChannelOptionData
     | ApplicationCommandAutocompleteOption
     | ApplicationCommandNumericOptionData
+    | ApplicationCommandStringOptionData
   )[];
 }
 
@@ -3937,6 +3952,7 @@ export type ApplicationCommandOptionData =
   | ApplicationCommandChoicesData
   | ApplicationCommandAutocompleteOption
   | ApplicationCommandNumericOptionData
+  | ApplicationCommandStringOptionData
   | ApplicationCommandSubCommandData;
 
 export type ApplicationCommandOption =
@@ -3945,6 +3961,7 @@ export type ApplicationCommandOption =
   | ApplicationCommandChannelOption
   | ApplicationCommandChoicesOption
   | ApplicationCommandNumericOption
+  | ApplicationCommandStringOption
   | ApplicationCommandSubCommand;
 
 export interface ApplicationCommandOptionChoiceData {