diff --git a/packages/core/src/services/build-application-command.spec.ts b/packages/core/src/services/build-application-command.spec.ts
index 39193e7d..c99f2261 100644
--- a/packages/core/src/services/build-application-command.spec.ts
+++ b/packages/core/src/services/build-application-command.spec.ts
@@ -6,6 +6,8 @@ import { ChatInputCommandOptions } from '../decorators/command/chat-input-comman
 import { Command } from '../decorators/command/command.decorator';
 import { Handler } from '../decorators/command/handler/handler.decorator';
 import { Param } from '../decorators/option/param/param.decorator';
+import { UseGroup } from '../decorators/sub-command-group/use-group';
+import { SubCommand } from '../decorators/sub-command/sub-command.decorator';
 import { OptionExplorer } from '../explorers/option/option.explorer';
 import { DiscordCommandProvider } from '../providers/discord-command.provider';
 import { ReflectMetadataProvider } from '../providers/reflect-metadata.provider';
@@ -157,4 +159,157 @@ describe('Build application command service', () => {
       },
     });
   });
+
+  describe('Subcommand', () => {
+    class EmailDto {
+      @Param({ description: 'Your email' })
+      email: string;
+    }
+
+    @SubCommand({
+      name: 'email',
+      description: 'Register by subcommand',
+    })
+    class EmailSubCommand {
+      @Handler()
+      // eslint-disable-next-line @typescript-eslint/no-unused-vars
+      onEmailCommand(dto: EmailDto) {
+        return 'ok';
+      }
+    }
+
+    @SubCommand({
+      name: 'base-info',
+      description: 'Return base info about user',
+    })
+    class BaseInfoSubCommand {
+      @Handler()
+      onBaseInfoCommand() {
+        return 'ok';
+      }
+    }
+
+    beforeEach(async () => {
+      testingModule = await Test.createTestingModule({
+        providers: [
+          BuildApplicationCommandService,
+          ReflectMetadataProvider,
+          DiscordCommandProvider,
+          DtoService,
+          OptionExplorer,
+          CommandHandlerFinderService,
+          MetadataScanner,
+          EmailSubCommand,
+          BaseInfoSubCommand,
+        ],
+      }).compile();
+    });
+
+    it('should explore slash sub command and add it to DiscordCommandProvider', async () => {
+      const buildApplicationCommand = testingModule.get(
+        BuildApplicationCommandService,
+      );
+
+      const commandOptions = {
+        name: 'reg',
+        description: 'User registration',
+        include: [
+          UseGroup(
+            { name: 'type', description: 'Registration type' },
+            EmailSubCommand,
+          ),
+          BaseInfoSubCommand,
+        ],
+      };
+
+      @Command(commandOptions)
+      class RegistrationCommand {}
+
+      const commandInstance = new RegistrationCommand();
+      const discordCommandProvider = testingModule.get(DiscordCommandProvider);
+      jest.spyOn(discordCommandProvider, 'addCommand');
+
+      const actual = await buildApplicationCommand.exploreCommand(
+        commandInstance,
+        commandOptions,
+      );
+
+      expect(actual).toStrictEqual(
+        expect.arrayContaining([
+          {
+            group: 'type',
+            instance: testingModule.get(EmailSubCommand),
+            methodName: 'onEmailCommand',
+            name: 'reg',
+            subName: 'email',
+          },
+          {
+            group: undefined,
+            instance: testingModule.get(BaseInfoSubCommand),
+            methodName: 'onBaseInfoCommand',
+            name: 'reg',
+            subName: 'base-info',
+          },
+        ]),
+      );
+
+      expect(discordCommandProvider.addCommand).toBeCalledWith(
+        RegistrationCommand,
+        {
+          additionalOptions: { forGuild: undefined },
+          commandData: {
+            defaultMemberPermissions: undefined,
+            description: 'User registration',
+            descriptionLocalizations: undefined,
+            dmPermission: undefined,
+            name: 'reg',
+            nameLocalizations: undefined,
+            options: [
+              {
+                description: 'Registration type',
+                descriptionLocalizations: undefined,
+                name: 'type',
+                nameLocalizations: undefined,
+                options: [
+                  {
+                    description: 'Register by subcommand',
+                    descriptionLocalizations: undefined,
+                    name: 'email',
+                    nameLocalizations: undefined,
+                    options: [
+                      {
+                        autocomplete: undefined,
+                        channelTypes: undefined,
+                        choices: undefined,
+                        description: 'Your email',
+                        descriptionLocalizations: undefined,
+                        maxLength: undefined,
+                        maxValue: undefined,
+                        minLength: undefined,
+                        minValue: undefined,
+                        name: 'email',
+                        nameLocalizations: undefined,
+                        required: false,
+                        type: 3,
+                      },
+                    ],
+                    type: 1,
+                  },
+                ],
+                type: 2,
+              },
+              {
+                description: 'Return base info about user',
+                descriptionLocalizations: undefined,
+                name: 'base-info',
+                nameLocalizations: undefined,
+                type: 1,
+              },
+            ],
+            type: 1,
+          },
+        },
+      );
+    });
+  });
 });