diff --git a/src/libcmdline/CommandLine.cs b/src/libcmdline/CommandLine.cs
index 885c8cbb..2f9d340c 100644
--- a/src/libcmdline/CommandLine.cs
+++ b/src/libcmdline/CommandLine.cs
@@ -201,8 +201,9 @@ public class OptionAttribute : BaseOptionAttribute
         /// Initializes a new instance of the <see cref="CommandLine.OptionAttribute"/> class.
         /// </summary>
         /// <param name="shortName">The short name of the option or null if not used.</param>
-        /// <param name="longName">The long name of the option or null if not used.</param>
-        public OptionAttribute(string shortName, string longName)
+        /// <param name="longName">The long name of the option or null if not used.</param>
+        /// <param name="mutuallyExclusiveSet">The option's mutually exclusive set</param>
+        public OptionAttribute(string shortName = null, string longName = null, string mutuallyExclusiveSet = null)
         {
             if (!string.IsNullOrEmpty(shortName))
                 _uniqueName = shortName;
@@ -213,7 +214,9 @@ public OptionAttribute(string shortName, string longName)
                 throw new InvalidOperationException();
 
             base.ShortName = shortName;
-            base.LongName = longName;
+            base.LongName = longName;
+            if (mutuallyExclusiveSet != null)
+                MutuallyExclusiveSet = mutuallyExclusiveSet;
         }
 
         #if UNIT_TESTS