diff --git a/DbService.cs b/DbService.cs
index b0936e1..f1d2aa5 100644
--- a/DbService.cs
+++ b/DbService.cs
@@ -10,7 +10,7 @@ using de.hottis.genericdatabaseapiservice.Models;
 
 namespace de.hottis.genericdatabaseapiservice.Services {
     public interface IDbService {
-        Task<List<TOUT>> ReadBySelect<TIN, TOUT>(string selectStatement, TIN input);
+        Task<List<TOUT>> ReadBySelect<TIN, TOUT>(string selectStatement, bool justOne, TIN input);
     } 
 
     public class DbServiceException : Exception {}