optionaluse of a and the

ps-grammar/restaurant/otherCommand.jsgf

@@ -2,7 +2,7 @@
 grammar restaurant_save_command;
 
 public <restaurant> = <followMe> | <stop> | <ordering> | <save>;
-<save> = save [[a] location];
+<save> = save [[the | a] location];
 <followMe> = (follow me) | (come [(with me) | here]) | (keep up);
 <ordering> = ordering;
 <stop> = stop [this];