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diff --git a/src/mscorlib/shared/System/Collections/IEnumerator.cs b/src/mscorlib/shared/System/Collections/IEnumerator.cs
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+// 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;
+using System.Runtime.InteropServices;
+
+namespace System.Collections
+{
+    // Base interface for all enumerators, providing a simple approach
+    // to iterating over a collection.
+    public interface IEnumerator
+    {
+        // Advances the enumerator to the next element of the enumeration and
+        // returns a boolean indicating whether an element is available. Upon
+        // creation, an enumerator is conceptually positioned before the first
+        // element of the enumeration, and the first call to MoveNext 
+        // brings the first element of the enumeration into view.
+        // 
+        bool MoveNext();
+
+        // Returns the current element of the enumeration. The returned value is
+        // undefined before the first call to MoveNext and following a
+        // call to MoveNext that returned false. Multiple calls to
+        // GetCurrent with no intervening calls to MoveNext 
+        // will return the same object.
+        // 
+        Object Current
+        {
+            get;
+        }
+
+        // Resets the enumerator to the beginning of the enumeration, starting over.
+        // The preferred behavior for Reset is to return the exact same enumeration.
+        // This means if you modify the underlying collection then call Reset, your
+        // IEnumerator will be invalid, just as it would have been if you had called
+        // MoveNext or Current.
+        //
+        void Reset();
+    }
+}