diff --git a/Functional/Tuple.cs b/Functional/Tuple.cs
index 7d72684..cf33904 100644
--- a/Functional/Tuple.cs
+++ b/Functional/Tuple.cs
@@ -4,5 +4,6 @@ public static class TupleExtensions
 {
     public static (T1, T2) ToTuple<T1, T2>(this T1 first, T2 second) => (first, second);
     public static (T1, T2, T3) ToTuple<T1, T2, T3>(this T1 first, T2 second, T3 third) => (first, second, third);
+    public static (T1, T2, T3, T4) ToTuple<T1, T2, T3, T4>(this T1 first, T2 second, T3 third, T4 forth) => (first, second, third, forth);
 }