diff --git a/AsyncFileWriter/AsyncFileWriter.cs b/AsyncFileWriter/AsyncFileWriter.cs
index bdafcb3..c1d2c21 100644
--- a/AsyncFileWriter/AsyncFileWriter.cs
+++ b/AsyncFileWriter/AsyncFileWriter.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Diagnostics.Contracts;
 using System.IO;
 using System.Text;
diff --git a/AsyncFileWriter/IDisposableAsync.cs b/AsyncFileWriter/IDisposableAsync.cs
new file mode 100644
index 0000000..c98d47c
--- /dev/null
+++ b/AsyncFileWriter/IDisposableAsync.cs
@@ -0,0 +1,9 @@
+using System.Threading.Tasks;
+
+namespace Open
+{
+    interface IDisposableAsync
+    {
+        Task DisposeAsync();
+    }
+}
diff --git a/AsyncFileWriterTester/Program.cs b/AsyncFileWriterTester/Program.cs
index 9704a17..5490eea 100644
--- a/AsyncFileWriterTester/Program.cs
+++ b/AsyncFileWriterTester/Program.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Threading.Tasks;
 
 namespace AsyncFileWriterTester