1 files changed, 20 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/Runtime/CompilerServices/StateMachineAttribute.cs b/src/mscorlib/shared/System/Runtime/CompilerServices/StateMachineAttribute.cs
new file mode 100644
index 0000000000..94ed5b5c74
--- /dev/null
+++ b/src/mscorlib/shared/System/Runtime/CompilerServices/StateMachineAttribute.cs
@@ -0,0 +1,20 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+
+namespace System.Runtime.CompilerServices
+{
+    [Serializable]
+    [AttributeUsage(AttributeTargets.Method, Inherited = false, AllowMultiple = false)]
+    public class StateMachineAttribute : Attribute
+    {
+        public StateMachineAttribute(Type stateMachineType)
+        {
+            StateMachineType = stateMachineType;
+        }
+
+        public Type StateMachineType { get; }
+    }
+}