diff --git a/include/tclap/ArgException.h b/include/tclap/ArgException.h
index 04d1c94..157619e 100644
--- a/include/tclap/ArgException.h
+++ b/include/tclap/ArgException.h
@@ -39,7 +39,8 @@ class ArgException : public std::exception
 		/**
 		 * Constructor.
 		 * \param text - The text of the exception.
-		 * \param id - The text identifying the argument source 
+		 * \param id - The text identifying the argument source.
+		 * \param td - Text describing the type of ArgException it is.
 		 * of the exception.
 		 */
 		ArgException( const std::string& text = "undefined exception",