src/jdk.javadoc/share/classes/jdk/javadoc/internal/tool/resources/javadoc.properties

@@ -236,15 +236,10 @@
 main.opt.add.reads.desc=\
     Specify additional modules to be considered as required by a\n\
     given module. <other-module> may be ALL-UNNAMED to require\n\
     the unnamed module.
 
-main.opt.Xmodule.arg=\
-    <module-name>
-main.opt.Xmodule.desc=\
-    Specify a module to which the classes being compiled belong
-
 main.opt.patch.module.arg=\
     <module>=<file>(:<file>)*
 main.opt.patch.module.desc=\
     Override or augment a module with classes and resources in\n\
     JAR files or directories