diff --git a/app/Theming/ThemeService.php b/app/Theming/ThemeService.php
index 602abaf1c..f0f8f033c 100644
--- a/app/Theming/ThemeService.php
+++ b/app/Theming/ThemeService.php
@@ -3,6 +3,8 @@
 namespace BookStack\Theming;
 
 use BookStack\Auth\Access\SocialAuthService;
+use Illuminate\Contracts\Console\Kernel;
+use Symfony\Component\Console\Command\Command;
 
 class ThemeService
 {
@@ -43,6 +45,16 @@ class ThemeService
         return null;
     }
 
+    /**
+     * Register a new custom artisan command to be available.
+     */
+    public function registerCommand(Command $command)
+    {
+        /** @var \Illuminate\Foundation\Console\Kernel $consoleKernel */
+        $consoleKernel = app()->make(Kernel::class);
+        $consoleKernel->registerCommand($command);
+    }
+
     /**
      * Read any actions from the set theme path if the 'functions.php' file exists.
      */
diff --git a/dev/docs/logical-theme-system.md b/dev/docs/logical-theme-system.md
index b950d7df9..4d6ed719b 100644
--- a/dev/docs/logical-theme-system.md
+++ b/dev/docs/logical-theme-system.md
@@ -77,6 +77,32 @@ Theme::listen(ThemeEvents::APP_BOOT, function($app) {
 });
 ```
 
+## Custom Commands
+
+The logical theme system supports adding custom [artisan commands](https://laravel.com/docs/8.x/artisan) to BookStack. These can be registered in your `functions.php` file by calling `Theme::registerCommand($command)`, where `$command` is an instance of `\Symfony\Component\Console\Command\Command`. 
+
+Below is an example of registering a command that could then be ran using `php artisan bookstack:meow` on the command line.
+
+```php
+<?php
+
+use BookStack\Facades\Theme;
+use Illuminate\Console\Command;
+
+class MeowCommand extends Command
+{
+    protected $signature = 'bookstack:meow';
+    protected $description = 'Say meow on the command line';
+
+    public function handle()
+    {
+        $this->line('Meow there!');
+    }
+}
+
+Theme::registerCommand(new MeowCommand);
+```
+
 ## Custom Socialite Service Example
 
 The below shows an example of adding a custom reddit socialite service to BookStack. 
diff --git a/tests/ThemeTest.php b/tests/ThemeTest.php
index 9aa7873b0..f04250bff 100644
--- a/tests/ThemeTest.php
+++ b/tests/ThemeTest.php
@@ -7,8 +7,10 @@ use BookStack\Entities\Models\Page;
 use BookStack\Entities\Tools\PageContent;
 use BookStack\Facades\Theme;
 use BookStack\Theming\ThemeEvents;
+use Illuminate\Console\Command;
 use Illuminate\Http\Request;
 use Illuminate\Http\Response;
+use Illuminate\Support\Facades\Artisan;
 use Illuminate\Support\Facades\File;
 use League\CommonMark\ConfigurableEnvironmentInterface;
 
@@ -206,6 +208,16 @@ class ThemeTest extends TestCase
         $this->assertStringContainsString('donkey=donut', $redirect);
     }
 
+    public function test_register_command_allows_provided_command_to_be_usable_via_artisan()
+    {
+        Theme::registerCommand(new MyCustomCommand);
+
+        Artisan::call('bookstack:test-custom-command', []);
+        $output = Artisan::output();
+
+        $this->assertStringContainsString('Command ran!', $output);
+    }
+
     protected function usingThemeFolder(callable $callback)
     {
         // Create a folder and configure a theme
@@ -220,3 +232,10 @@ class ThemeTest extends TestCase
         File::deleteDirectory($themeFolderPath);
     }
 }
+
+class MyCustomCommand extends Command {
+    protected $signature = 'bookstack:test-custom-command';
+    public function handle() {
+        $this->line('Command ran!');
+    }
+}
\ No newline at end of file