1 files changed, 7 insertions, 0 deletions
diff --git a/lib/System.Core/ExtensionAttribute.cs b/lib/System.Core/ExtensionAttribute.cs
new file mode 100644
index 00000000..fcb186f3
--- /dev/null
+++ b/lib/System.Core/ExtensionAttribute.cs
@@ -0,0 +1,7 @@
+
+namespace System.Runtime.CompilerServices
+{
+    /// <summary> Used for 2.0 compatibility </summary>
+    [AttributeUsage(AttributeTargets.Method)]
+    public sealed class ExtensionAttribute : Attribute { }
+}