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diff --git a/src/DotNetOpenAuth.OpenId/OpenId/Extensions/ProviderAuthenticationPolicy/NistAssuranceLevel.cs b/src/DotNetOpenAuth.OpenId/OpenId/Extensions/ProviderAuthenticationPolicy/NistAssuranceLevel.cs
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+++ b/src/DotNetOpenAuth.OpenId/OpenId/Extensions/ProviderAuthenticationPolicy/NistAssuranceLevel.cs
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+//-----------------------------------------------------------------------
+// <copyright file="NistAssuranceLevel.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OpenId.Extensions.ProviderAuthenticationPolicy {
+	using System;
+	using System.Collections.Generic;
+	using System.Diagnostics.CodeAnalysis;
+	using System.Text;
+
+	/// <summary>
+	/// Descriptions for NIST-defined levels of assurance that a credential
+	/// has not been compromised and therefore the extent to which an
+	/// authentication assertion can be trusted.
+	/// </summary>
+	/// <remarks>
+	/// <para>One using this enum should review the following publication for details
+	/// before asserting or interpreting what these levels signify, notwithstanding
+	/// the brief summaries attached to each level in DotNetOpenAuth documentation.
+	/// http://csrc.nist.gov/publications/nistpubs/800-63/SP800-63V1_0_2.pdf</para>
+	/// <para>
+	/// See PAPE spec Appendix A.1.2 (NIST Assurance Levels) for high-level example classifications of authentication methods within the defined levels.
+	/// </para>
+	/// </remarks>
+	[SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "Nist", Justification = "By design")]
+	public enum NistAssuranceLevel {
+		/// <summary>
+		/// Not an assurance level defined by NIST, but rather SHOULD be used to 
+		/// signify that the OP recognizes the parameter and the End User 
+		/// authentication did not meet the requirements of Level 1.
+		/// </summary>
+		InsufficientForLevel1 = 0,
+
+		/// <summary>
+		/// See this document for a thorough description:
+		/// http://csrc.nist.gov/publications/nistpubs/800-63/SP800-63V1_0_2.pdf
+		/// </summary>
+		Level1 = 1,
+
+		/// <summary>
+		/// See this document for a thorough description:
+		/// http://csrc.nist.gov/publications/nistpubs/800-63/SP800-63V1_0_2.pdf
+		/// </summary>
+		Level2 = 2,
+
+		/// <summary>
+		/// See this document for a thorough description:
+		/// http://csrc.nist.gov/publications/nistpubs/800-63/SP800-63V1_0_2.pdf
+		/// </summary>
+		Level3 = 3,
+
+		/// <summary>
+		/// See this document for a thorough description:
+		/// http://csrc.nist.gov/publications/nistpubs/800-63/SP800-63V1_0_2.pdf
+		/// </summary>
+		Level4 = 4,
+	}
+}