diff --git a/AsbCloudWebApi/Controllers/DrillingProgramController.cs b/AsbCloudWebApi/Controllers/DrillingProgramController.cs
index 05087540..4fc2d13f 100644
--- a/AsbCloudWebApi/Controllers/DrillingProgramController.cs
+++ b/AsbCloudWebApi/Controllers/DrillingProgramController.cs
@@ -119,7 +119,7 @@ namespace AsbCloudWebApi.Controllers
                 return BadRequest(ArgumentInvalidException.MakeValidationError(nameof(files), "only 1 file can be uploaded"));
 
             if (files.Count == 0)
-                return BadRequest(ArgumentInvalidException.MakeValidationError(nameof(files), "at list 1 file can be uploaded"));
+                return BadRequest(ArgumentInvalidException.MakeValidationError(nameof(files), "at list 1 file should be uploaded"));
 
             var fileName = files[0].FileName;