diff --git a/AsbCloudWebApi/Controllers/WellOperationController.cs b/AsbCloudWebApi/Controllers/WellOperationController.cs
index 3a4d1c68..838801af 100644
--- a/AsbCloudWebApi/Controllers/WellOperationController.cs
+++ b/AsbCloudWebApi/Controllers/WellOperationController.cs
@@ -32,7 +32,7 @@ namespace AsbCloudWebApi.Controllers
         /// <returns></returns>
         [HttpGet]
         [Route("categories")]
-        [ProducesResponseType(typeof(IEnumerable<string>), (int)System.Net.HttpStatusCode.OK)]
+        [ProducesResponseType(typeof(IEnumerable<WellOperationCategoryDto>), (int)System.Net.HttpStatusCode.OK)]
         public IActionResult GetCategories()
         {
             var result = operationService.GetCategories();