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diff --git a/src/mscorlib/src/System/Globalization/NumberStyles.cs b/src/mscorlib/src/System/Globalization/NumberStyles.cs
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+++ b/src/mscorlib/src/System/Globalization/NumberStyles.cs
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+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+/*============================================================
+**
+**
+**
+** Purpose: Contains valid formats for Numbers recognized by
+** the Number class' parsing code.
+**
+**
+===========================================================*/
+namespace System.Globalization {
+    
+    using System;
+    [Serializable]
+    [Flags]
+    [System.Runtime.InteropServices.ComVisible(true)]
+    public enum NumberStyles {
+        // Bit flag indicating that leading whitespace is allowed. Character values
+        // 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, and 0x0020 are considered to be
+        // whitespace.
+    
+        None                  = 0x00000000, 
+
+        AllowLeadingWhite     = 0x00000001, 
+
+        AllowTrailingWhite    = 0x00000002, //Bitflag indicating trailing whitespace is allowed.
+
+        AllowLeadingSign      = 0x00000004, //Can the number start with a sign char.  
+                                            //Specified by NumberFormatInfo.PositiveSign and NumberFormatInfo.NegativeSign
+
+        AllowTrailingSign     = 0x00000008, //Allow the number to end with a sign char
+
+        AllowParentheses      = 0x00000010, //Allow the number to be enclosed in parens
+
+        AllowDecimalPoint     = 0x00000020, //Allow a decimal point
+
+        AllowThousands        = 0x00000040, //Allow thousands separators (more properly, allow group separators)
+
+        AllowExponent         = 0x00000080, //Allow an exponent
+
+        AllowCurrencySymbol   = 0x00000100, //Allow a currency symbol.
+
+        AllowHexSpecifier     = 0x00000200, //Allow specifiying hexadecimal.
+        //Common uses.  These represent some of the most common combinations of these flags.
+    
+
+        Integer  = AllowLeadingWhite | AllowTrailingWhite | AllowLeadingSign,
+
+        HexNumber = AllowLeadingWhite | AllowTrailingWhite | AllowHexSpecifier,
+
+        Number   = AllowLeadingWhite | AllowTrailingWhite | AllowLeadingSign | AllowTrailingSign |
+                   AllowDecimalPoint | AllowThousands,
+
+        Float    = AllowLeadingWhite | AllowTrailingWhite | AllowLeadingSign | 
+                   AllowDecimalPoint | AllowExponent,
+
+        Currency = AllowLeadingWhite | AllowTrailingWhite | AllowLeadingSign | AllowTrailingSign |
+                   AllowParentheses  | AllowDecimalPoint | AllowThousands | AllowCurrencySymbol,
+
+        Any      = AllowLeadingWhite | AllowTrailingWhite | AllowLeadingSign | AllowTrailingSign |
+                   AllowParentheses  | AllowDecimalPoint | AllowThousands | AllowCurrencySymbol | AllowExponent,
+             
+    }
+}