1 files changed, 24 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/ICustomFormatter.cs b/src/mscorlib/shared/System/ICustomFormatter.cs
new file mode 100644
index 0000000000..47340f3093
--- /dev/null
+++ b/src/mscorlib/shared/System/ICustomFormatter.cs
@@ -0,0 +1,24 @@
+// 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.
+
+/*============================================================
+**
+** Interface:  ICustomFormatter
+**
+**
+** Purpose: Marks a class as providing special formatting
+**
+**
+===========================================================*/
+
+using System;
+
+namespace System
+{
+    public interface ICustomFormatter
+    {
+        // Interface does not need to be marked with the serializable attribute
+        String Format(String format, Object arg, IFormatProvider formatProvider);
+    }
+}