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diff --git a/src/mscorlib/src/System/Collections/Generic/IList.cs b/src/mscorlib/src/System/Collections/Generic/IList.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.
+
+/*============================================================
+**
+** Interface:  IList
+** 
+** 
+**
+**
+** Purpose: Base interface for all generic lists.
+**
+** 
+===========================================================*/
+namespace System.Collections.Generic {
+    
+    using System;
+    using System.Collections;
+    using System.Runtime.CompilerServices;
+    using System.Diagnostics.Contracts;
+
+    // An IList is an ordered collection of objects.  The exact ordering
+    // is up to the implementation of the list, ranging from a sorted
+    // order to insertion order.  
+
+    // Note that T[] : IList<T>, and we want to ensure that if you use
+    // IList<YourValueType>, we ensure a YourValueType[] can be used 
+    // without jitting.  Hence the TypeDependencyAttribute on SZArrayHelper.
+    // This is a special workaround internally though - see VM\compile.cpp.
+    // The same attribute is on IEnumerable<T> and ICollection<T>.
+    [TypeDependencyAttribute("System.SZArrayHelper")]
+    public interface IList<T> : ICollection<T>
+    {
+        // The Item property provides methods to read and edit entries in the List.
+        T this[int index] {
+            get;
+            set;
+        }
+    
+        // Returns the index of a particular item, if it is in the list.
+        // Returns -1 if the item isn't in the list.
+        int IndexOf(T item);
+    
+        // Inserts value into the list at position index.
+        // index must be non-negative and less than or equal to the 
+        // number of elements in the list.  If index equals the number
+        // of items in the list, then value is appended to the end.
+        void Insert(int index, T item);
+        
+        // Removes the item at position index.
+        void RemoveAt(int index);
+    }
+}