Update README.md

README.md

@@ -44,6 +44,9 @@ test input is
 
 `select s.name from student s where s.name = "John" and s.num = 10;`.
 
+The files added in Spring 2019 are appended with `_new`. To run the new 
+executable, the command is `./SQLPParser_new`.
+
 Currently a syntax error will be reported when the semi-colon is read, but the
 parse tree that is output is correct.