Document module_wrapper substitutions.
@@ -310,7 +310,10 @@ public class CommandLineRunner extends
usage = "An output wrapper for a JavaScript module (optional). "
+ "The format is <name>:<wrapper>. The module name must correspond "
+ "with a module specified using --module. The wrapper must "
- + "contain %s as the code placeholder. The %basename% placeholder can "
+ + "contain %s as the code placeholder. "
+ + "Alternately, %output% can be used in place of %s. "
+ + "%n% can be used to represent a newline. "
+ + "The %basename% placeholder can "
+ "also be used to substitute the base name of the module output file.")
private List<String> moduleWrapper = new ArrayList<>();
