diff --git a/src/Squidex/Areas/Api/Controllers/Apps/AppClientsController.cs b/src/Squidex/Areas/Api/Controllers/Apps/AppClientsController.cs
index bd9b70cc3..92b2fce2c 100644
--- a/src/Squidex/Areas/Api/Controllers/Apps/AppClientsController.cs
+++ b/src/Squidex/Areas/Api/Controllers/Apps/AppClientsController.cs
@@ -93,7 +93,8 @@ namespace Squidex.Areas.Api.Controllers.Apps
         /// <param name="request">Client object that needs to be updated.</param>
         /// <returns>
         /// 204 => Client updated.
-        /// 404 => App not found or client not found.
+        /// 400 => Client request not valid.
+        /// 404 => Client or app not found.
         /// </returns>
         /// <remarks>
         /// Only the display name can be changed, create a new client if necessary.
@@ -115,7 +116,7 @@ namespace Squidex.Areas.Api.Controllers.Apps
         /// <param name="clientId">The id of the client that must be deleted.</param>
         /// <returns>
         /// 204 => Client revoked.
-        /// 404 => App not found or client not found.
+        /// 404 => Client or app not found.
         /// </returns>
         /// <remarks>
         /// The application that uses this client credentials cannot access the API after it has been revoked.
diff --git a/src/Squidex/Areas/Api/Controllers/Apps/AppContributorsController.cs b/src/Squidex/Areas/Api/Controllers/Apps/AppContributorsController.cs
index aa8cd6ac7..4f44f8288 100644
--- a/src/Squidex/Areas/Api/Controllers/Apps/AppContributorsController.cs
+++ b/src/Squidex/Areas/Api/Controllers/Apps/AppContributorsController.cs
@@ -88,7 +88,7 @@ namespace Squidex.Areas.Api.Controllers.Apps
         /// <returns>
         /// 204 => User removed from app.
         /// 400 => User is not assigned to the app.
-        /// 404 => App not found.
+        /// 404 => Contributor or app not found.
         /// </returns>
         [HttpDelete]
         [Route("apps/{app}/contributors/{id}/")]
diff --git a/src/Squidex/Areas/Api/Controllers/Apps/AppLanguagesController.cs b/src/Squidex/Areas/Api/Controllers/Apps/AppLanguagesController.cs
index 53dff0972..070dea103 100644
--- a/src/Squidex/Areas/Api/Controllers/Apps/AppLanguagesController.cs
+++ b/src/Squidex/Areas/Api/Controllers/Apps/AppLanguagesController.cs
@@ -71,7 +71,7 @@ namespace Squidex.Areas.Api.Controllers.Apps
         /// <param name="request">The language to add to the app.</param>
         /// <returns>
         /// 201 => Language created.
-        /// 400 => Language is an invalid language.
+        /// 400 => Language request not valid.
         /// 404 => App not found.
         /// </returns>
         [MustBeAppEditor]
@@ -97,8 +97,8 @@ namespace Squidex.Areas.Api.Controllers.Apps
         /// <param name="request">The language object.</param>
         /// <returns>
         /// 204 => Language updated.
-        /// 400 => Language object is invalid.
-        /// 404 => App not found.
+        /// 400 => Language request not valid.
+        /// 404 => Language or app not found.
         /// </returns>
         [MustBeAppEditor]
         [HttpPut]
@@ -118,7 +118,7 @@ namespace Squidex.Areas.Api.Controllers.Apps
         /// <param name="language">The language to delete from the app.</param>
         /// <returns>
         /// 204 => Language deleted.
-        /// 404 => App not found.
+        /// 404 => Language or app not found.
         /// </returns>
         [MustBeAppEditor]
         [HttpDelete]
diff --git a/src/Squidex/Areas/Api/Controllers/Apps/AppPatternsController.cs b/src/Squidex/Areas/Api/Controllers/Apps/AppPatternsController.cs
index 6d80d8a35..c33cbcf5a 100644
--- a/src/Squidex/Areas/Api/Controllers/Apps/AppPatternsController.cs
+++ b/src/Squidex/Areas/Api/Controllers/Apps/AppPatternsController.cs
@@ -64,6 +64,7 @@ namespace Squidex.Areas.Api.Controllers.Apps
         /// <param name="request">Pattern to be added to the app.</param>
         /// <returns>
         /// 201 => Pattern generated.
+        /// 400 => Pattern request not valid.
         /// 404 => App not found.
         /// </returns>
         [HttpPost]
@@ -89,7 +90,8 @@ namespace Squidex.Areas.Api.Controllers.Apps
         /// <param name="request">Pattern to be updated for the app.</param>
         /// <returns>
         /// 204 => Pattern updated.
-        /// 404 => App not found or pattern not found.
+        /// 400 => Pattern request not valid.
+        /// 404 => Pattern or app not found.
         /// </returns>
         [HttpPut]
         [Route("apps/{app}/patterns/{id}/")]
@@ -111,7 +113,7 @@ namespace Squidex.Areas.Api.Controllers.Apps
         /// <param name="id">The id of the pattern to be deleted.</param>
         /// <returns>
         /// 204 => Pattern removed.
-        /// 404 => App or pattern not found.
+        /// 404 => Pattern or app not found.
         /// </returns>
         /// <remarks>
         /// Schemas using this pattern will still function using the same Regular Expression
diff --git a/src/Squidex/Areas/Api/Controllers/Apps/AppsController.cs b/src/Squidex/Areas/Api/Controllers/Apps/AppsController.cs
index 2215e838f..66b178361 100644
--- a/src/Squidex/Areas/Api/Controllers/Apps/AppsController.cs
+++ b/src/Squidex/Areas/Api/Controllers/Apps/AppsController.cs
@@ -83,7 +83,7 @@ namespace Squidex.Areas.Api.Controllers.Apps
         /// <param name="request">The app object that needs to be added to squidex.</param>
         /// <returns>
         /// 201 => App created.
-        /// 400 => App object is not valid.
+        /// 400 => App request not valid.
         /// 409 => App name is already in use.
         /// </returns>
         /// <remarks>
diff --git a/src/Squidex/Areas/Api/Controllers/Statistics/UsagesController.cs b/src/Squidex/Areas/Api/Controllers/Statistics/UsagesController.cs
index 380ed2365..a1ce33008 100644
--- a/src/Squidex/Areas/Api/Controllers/Statistics/UsagesController.cs
+++ b/src/Squidex/Areas/Api/Controllers/Statistics/UsagesController.cs
@@ -130,8 +130,8 @@ namespace Squidex.Areas.Api.Controllers.Statistics
         /// <param name="toDate">The to date.</param>
         /// <returns>
         /// 200 => Storage usage returned.
-        /// 404 => App not found.
         /// 400 => Range between from date and to date is not valid or has more than 100 days.
+        /// 404 => App not found.
         /// </returns>
         [HttpGet]
         [Route("apps/{app}/usages/storage/{fromDate}/{toDate}/")]