diff --git a/Documentation/CustomMapping.md b/Documentation/CustomMapping.md
index d5ff9f0..98e16eb 100644
--- a/Documentation/CustomMapping.md
+++ b/Documentation/CustomMapping.md
@@ -64,8 +64,9 @@ ORDER BY p.id ASC
             "CustomMapping",
             typeof(PersonCustom),
             Gedaq.Common.Enums.MethodType.Async | Gedaq.Common.Enums.MethodType.Sync
-            )]
-[Parametr("CustomMapping", parametrType: typeof(int), parametrName: "id", dbType: System.Data.DbType.Int32)]
+            ),
+            Parametr(parametrType: typeof(int), parametrName: "id", dbType: System.Data.DbType.Int32)
+            ]
 public async Task SomeMethod(DbConnection connection)
 {
     var persons = connection.CustomMapping(3).ToList();
diff --git a/Documentation/Parametr.md b/Documentation/Parametr.md
index 8317915..cc4c336 100644
--- a/Documentation/Parametr.md
+++ b/Documentation/Parametr.md
@@ -13,7 +13,8 @@ public ParametrAttribute(
   bool sourceColumnNullMapping = false,
   DataRowVersion sourceVersion = DataRowVersion.Current,
   byte scale = 0, 
-  byte precision = 0
+  byte precision = 0,
+  string methodParametrName = null
   )
 
 ```