diff --git a/Source/ExcelRna.Extensions.Hosting/IExcelFunctionsProvider.cs b/Source/ExcelRna.Extensions.Hosting/IExcelFunctionsProvider.cs
index c456326..94b85d0 100644
--- a/Source/ExcelRna.Extensions.Hosting/IExcelFunctionsProvider.cs
+++ b/Source/ExcelRna.Extensions.Hosting/IExcelFunctionsProvider.cs
@@ -46,6 +46,8 @@ private static bool TryCreateFunctionRegistration(MethodInfo methodInfo, IServic
             excelFunctionAttribute.Name ??= lambda.Name;
             var parameters = methodInfo.GetParameters().Select(p => new ExcelParameterRegistration(p));
             registration = new ExcelFunctionRegistration(lambda, excelFunctionAttribute, parameters);
+            registration.CustomAttributes.AddRange(methodInfo.GetCustomAttributes(true).Where(a => a is not ExcelFunctionAttribute));
+            registration.ReturnRegistration.CustomAttributes.AddRange(methodInfo.ReturnParameter.GetCustomAttributes(true));
             return true;
         }