A new javadoc command-line option, `--add-stylesheet`, has been added to the javadoc tool. The new `--add-stylesheet` option provides support for the use of multiple stylesheets in the generated documentation. The existing `-stylesheetfile` option now has an alias, `--main-stylesheet`, to help distinguish the main stylesheet from any additional stylesheets. For more details, see the [javadoc](https://docs.oracle.com/javase/10/tools/javadoc.htm#JSWOR-GUID-9D532574-1CDB-4D30-99F3-A308DCAEE55F) section in the Tools Reference document.