diff --git a/README.md b/README.md
index 408ee1b..a18fe87 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Sera.Union
+# Coplt.Union
 
 [![.NET](https://github.com/coplt/Coplt.Union/actions/workflows/dotnet.yml/badge.svg)](https://github.com/coplt/Coplt.Union/actions/workflows/dotnet.yml)
 ![MIT](https://img.shields.io/github/license/coplt/Coplt.Union)
@@ -303,7 +303,7 @@ public readonly partial struct Union1
 
 #### How to use
 
-You can use pattern matching or manually determine the Tag
+You can use pattern matching or manually determine the Tag, but remember C# does not have enumeration exhaustion semantics
 
 ```cs
 var u = Union1.MakeA(123);