diff --git a/ClosedXML/XLHelper.cs b/ClosedXML/XLHelper.cs
index 33acd91..585b8ca 100644
--- a/ClosedXML/XLHelper.cs
+++ b/ClosedXML/XLHelper.cs
@@ -85,9 +85,11 @@
         private static readonly string[] letters = new[] { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };
 
         /// <summary>
-        /// 	Gets the column letter of a given column number.
+        /// Gets the column letter of a given column number.
         /// </summary>
-        /// <param name="columnNumber"> The column number to translate into a column letter. </param>
+        /// <param name="columnNumber">The column number to translate into a column letter.</param>
+        /// <param name="trimToAllowed">if set to <c>true</c> the column letter will be restricted to the allowed range.</param>
+        /// <returns></returns>
         public static string GetColumnLetterFromNumber(int columnNumber, bool trimToAllowed = false)
         {
             if (trimToAllowed) columnNumber = TrimColumnNumber(columnNumber);