diff --git a/Jellyfin.Api/Controllers/StartupController.cs b/Jellyfin.Api/Controllers/StartupController.cs
index afc9b8f3da..ed1dc1ede3 100644
--- a/Jellyfin.Api/Controllers/StartupController.cs
+++ b/Jellyfin.Api/Controllers/StartupController.cs
@@ -5,6 +5,7 @@ using Jellyfin.Api.Models.StartupDtos;
 using MediaBrowser.Controller.Configuration;
 using MediaBrowser.Controller.Library;
 using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
 
 namespace Jellyfin.Api.Controllers
@@ -30,22 +31,28 @@ namespace Jellyfin.Api.Controllers
         }
 
         /// <summary>
-        /// Api endpoint for completing the startup wizard.
+        /// Completes the startup wizard.
         /// </summary>
+        /// <response code="200">Startup wizard completed.</response>
+        /// <returns>An <see cref="OkResult"/> indicating success.</returns>
         [HttpPost("Complete")]
-        public void CompleteWizard()
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        public ActionResult CompleteWizard()
         {
             _config.Configuration.IsStartupWizardCompleted = true;
             _config.SetOptimalValues();
             _config.SaveConfiguration();
+            return Ok();
         }
 
         /// <summary>
-        /// Endpoint for getting the initial startup wizard configuration.
+        /// Gets the initial startup wizard configuration.
         /// </summary>
-        /// <returns>The initial startup wizard configuration.</returns>
+        /// <response code="200">Initial startup wizard configuration retrieved.</response>
+        /// <returns>An <see cref="OkResult"/> containing the initial startup wizard configuration.</returns>
         [HttpGet("Configuration")]
-        public StartupConfigurationDto GetStartupConfiguration()
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        public ActionResult<StartupConfigurationDto> GetStartupConfiguration()
         {
             var result = new StartupConfigurationDto
             {
@@ -58,13 +65,16 @@ namespace Jellyfin.Api.Controllers
         }
 
         /// <summary>
-        /// Endpoint for updating the initial startup wizard configuration.
+        /// Sets the initial startup wizard configuration.
         /// </summary>
         /// <param name="uiCulture">The UI language culture.</param>
         /// <param name="metadataCountryCode">The metadata country code.</param>
         /// <param name="preferredMetadataLanguage">The preferred language for metadata.</param>
+        /// <response code="200">Configuration saved.</response>
+        /// <returns>An <see cref="OkResult"/> indicating success.</returns>
         [HttpPost("Configuration")]
-        public void UpdateInitialConfiguration(
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        public ActionResult UpdateInitialConfiguration(
             [FromForm] string uiCulture,
             [FromForm] string metadataCountryCode,
             [FromForm] string preferredMetadataLanguage)
@@ -73,43 +83,51 @@ namespace Jellyfin.Api.Controllers
             _config.Configuration.MetadataCountryCode = metadataCountryCode;
             _config.Configuration.PreferredMetadataLanguage = preferredMetadataLanguage;
             _config.SaveConfiguration();
+            return Ok();
         }
 
         /// <summary>
-        /// Endpoint for (dis)allowing remote access and UPnP.
+        /// Sets remote access and UPnP.
         /// </summary>
         /// <param name="enableRemoteAccess">Enable remote access.</param>
         /// <param name="enableAutomaticPortMapping">Enable UPnP.</param>
+        /// <response code="200">Configuration saved.</response>
+        /// <returns>An <see cref="OkResult"/> indicating success.</returns>
         [HttpPost("RemoteAccess")]
-        public void SetRemoteAccess([FromForm] bool enableRemoteAccess, [FromForm] bool enableAutomaticPortMapping)
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        public ActionResult SetRemoteAccess([FromForm] bool enableRemoteAccess, [FromForm] bool enableAutomaticPortMapping)
         {
             _config.Configuration.EnableRemoteAccess = enableRemoteAccess;
             _config.Configuration.EnableUPnP = enableAutomaticPortMapping;
             _config.SaveConfiguration();
+            return Ok();
         }
 
         /// <summary>
-        /// Endpoint for returning the first user.
+        /// Gets the first user.
         /// </summary>
+        /// <response code="200">Initial user retrieved.</response>
         /// <returns>The first user.</returns>
         [HttpGet("User")]
-        public StartupUserDto GetFirstUser()
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        public ActionResult<StartupUserDto> GetFirstUser()
         {
             var user = _userManager.Users.First();
-            return new StartupUserDto
-            {
-                Name = user.Name,
-                Password = user.Password
-            };
+            return new StartupUserDto { Name = user.Name, Password = user.Password };
         }
 
         /// <summary>
-        /// Endpoint for updating the user name and password.
+        /// Sets the user name and password.
         /// </summary>
         /// <param name="startupUserDto">The DTO containing username and password.</param>
-        /// <returns>The async task.</returns>
+        /// <response code="200">Updated user name and password.</response>
+        /// <returns>
+        /// A <see cref="Task" /> that represents the asynchronous update operation.
+        /// The task result contains an <see cref="OkResult"/> indicating success.
+        /// </returns>
         [HttpPost("User")]
-        public async Task UpdateUser([FromForm] StartupUserDto startupUserDto)
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        public async Task<ActionResult> UpdateUser([FromForm] StartupUserDto startupUserDto)
         {
             var user = _userManager.Users.First();
 
@@ -121,6 +139,8 @@ namespace Jellyfin.Api.Controllers
             {
                 await _userManager.ChangePassword(user, startupUserDto.Password).ConfigureAwait(false);
             }
+
+            return Ok();
         }
     }
 }