diff --git a/SmsSender.cs b/SmsSender.cs
index 731cfa5..fd12290 100644
--- a/SmsSender.cs
+++ b/SmsSender.cs
@@ -64,7 +64,7 @@ public SmsSender(string portName, short countryCode, long localNumber, string te
 
             if (string.IsNullOrWhiteSpace(text))
             {
-                throw new ArgumentNullException("A text must be specified.", "text");
+                throw new ArgumentNullException("text", "A text must be specified.");
             }
 
             // Port creation.
@@ -240,4 +240,4 @@ private void SetSize(PduSmsMessage pduMessage)
             }
         }
     }
-}
\ No newline at end of file
+}