--- old/src/jdk.jpackage/share/classes/jdk/jpackage/internal/resources/MainResources_ja.properties	2019-04-18 15:32:15.835558900 -0400
+++ new/src/jdk.jpackage/share/classes/jdk/jpackage/internal/resources/MainResources_ja.properties	2019-04-18 15:32:14.478332800 -0400
@@ -81,8 +81,8 @@
 ERR_MissingAppResources=Error: No application jars found.
 ERR_AppImageNotExist=Error: App image directory "{0}" does not exist.
 ERR_AppImageInvalid=Error: App image directory "{0}" does not contain "app" sub-directory.
-ERR_NoAddLauncherName=Error: Add Launchers require a name parameter.
-ERR_NoUniqueName=Error: Add Launchers require a unique name parameter.
+ERR_NoAddLauncherName=Error: --add-launcher option require a name and a file path (--add-launcher <name>=<file path>).
+ERR_NoUniqueName=Error: --add-launcher <name>=<file path> require a unique name.
 ERR_NoJreInstallerName=Error: Jre Installers require a name parameter.
 ERR_InvalidAppName=Error: Invalid Application name: {0}.
 ERR_InvalidSLName=Error: Invalid Add Launcher name: {0}.