diff --git a/include/tclap/MultiArg.h b/include/tclap/MultiArg.h
index 6db0f98..01edd3c 100644
--- a/include/tclap/MultiArg.h
+++ b/include/tclap/MultiArg.h
@@ -200,7 +200,7 @@ MultiArg<T>::MultiArg(const string& flag,
 		string temp( os.str() );
 
 		if ( i > 0 )
-			_typeDesc += ",";
+			_typeDesc += "|";
 		_typeDesc += temp;
 	}
 };
diff --git a/include/tclap/ValueArg.h b/include/tclap/ValueArg.h
index ddd2cef..8e28627 100644
--- a/include/tclap/ValueArg.h
+++ b/include/tclap/ValueArg.h
@@ -221,7 +221,7 @@ ValueArg<T>::ValueArg(const string& flag,
 		string temp( os.str() ); 
 
 		if ( i > 0 )
-			_typeDesc += ",";
+			_typeDesc += "|";
 		_typeDesc += temp;
 	}
 }