--- a/src/java.base/share/classes/sun/launcher/resources/launcher.properties	Wed Apr 18 15:12:28 2018 +0200
+++ b/src/java.base/share/classes/sun/launcher/resources/launcher.properties	Mon Apr 16 16:52:08 2018 -0700
@@ -113,6 +113,8 @@
 \                  one or more argument files containing options\n\
 \    -disable-@files\n\
 \                  prevent further argument file expansion\n\
+\    --enable-preview\n\
+\                  allow classes to depend on preview features of this release
 \To specify an argument for a long option, you can use --<name>=<value> or\n\
 \--<name> <value>.\n