diff --git a/xml/System.ComponentModel.DataAnnotations/RegularExpressionAttribute.xml b/xml/System.ComponentModel.DataAnnotations/RegularExpressionAttribute.xml
index 1792f982775..8643b7153f8 100644
--- a/xml/System.ComponentModel.DataAnnotations/RegularExpressionAttribute.xml
+++ b/xml/System.ComponentModel.DataAnnotations/RegularExpressionAttribute.xml
@@ -199,18 +199,17 @@ The regular expression searches for an exact match, not using `^` before and `$`
       </Parameters>
       <Docs>
         <param name="value">The data field value to validate.</param>
-        <summary>Checks whether the value entered by the user matches the regular expression pattern.</summary>
+        <summary>Converts the value entered by the user to a string using <see cref="M:System.Convert.ToString(System.Object,System.IFormatProvider)" /> with <see cref="P:System.Globalization.CultureInfo.CurrentCulture" /> and matches it with the regular expression pattern. If <paramref name="value"/> is null, or is converted to a null or empty string then it is considered valid.</summary>
         <returns>
-          <see langword="true" /> if validation is successful; otherwise, <see langword="false" />.</returns>
+          <see langword="true" /> if validation is successful - or if <paramref name="value"/> is null, or is converted to an empty string; otherwise, <see langword="false" />.</returns>
         <remarks>
           <format type="text/markdown"><![CDATA[
 This override performs the specific regular expression matching of `value` field.
           ]]></format>
         </remarks>
-        <exception cref="T:System.ComponentModel.DataAnnotations.ValidationException">The data field value did not match the regular expression pattern.</exception>
-        <exception cref="T:System.InvalidOperationException">The current attribute is ill-formed.</exception>
+        <exception cref="T:System.InvalidOperationException"><see cref="P:System.ComponentModel.DataAnnotations.RegularExpressionAttribute.Pattern" /> is null or empty.</exception>
         <exception cref="T:System.ArgumentException">
-          <see cref="P:System.ComponentModel.DataAnnotations.RegularExpressionAttribute.Pattern" /> is not a valid regular expression.</exception>
+          <see cref="P:System.ComponentModel.DataAnnotations.RegularExpressionAttribute.Pattern" /> is not a valid regular expression (directly thrown from <see cref="P:System.Text.RegularExpressions.Regex" />'s constructor).</exception>
       </Docs>
     </Member>
     <Member MemberName="MatchTimeout">