dev-java/java-config: manpage should describe the "-J" (upper case) option It's described in help but not in manpage. java-config -h Usage: java-config [options] Java Configuration Utility Version 2.3.1 Copyright 2004-2013 Gentoo Foundation Distributed under the terms of the GNU General Public License v2 Please contact the Gentoo Java Herd <java@gentoo.org> with problems. Options: -h, --help show this help message and exit -V, --version Print version information --select-vm=VM Use this vm instead of the active vm when returning information -n, --nocolor Disable color output Queries: -J, --java Print the location of the java executable -c, --javac Print the location of the javac executable -j, --jar Print the location of the jar executable