diff -r 2e5d313df9fd -r a48d4f74d322 langtools/src/jdk.jshell/share/classes/jdk/internal/jshell/tool/resources/l10n.properties
--- a/langtools/src/jdk.jshell/share/classes/jdk/internal/jshell/tool/resources/l10n.properties	Wed Dec 14 16:32:07 2016 +0100
+++ b/langtools/src/jdk.jshell/share/classes/jdk/internal/jshell/tool/resources/l10n.properties	Wed Dec 21 20:14:39 2016 -0800
@@ -169,12 +169,12 @@
 \    --module-path <path>  Specify where to find application modules\n\
 \    --add-modules <module>(,<module>)*\n\
 \                          Specify modules to resolve, or all modules on the\n\
-\                           module path if <module> is ALL-MODULE-PATHs\n\
+\                            module path if <module> is ALL-MODULE-PATHs\n\
 \    --startup <file>      One run replacement for the start-up definitions\n\
 \    --no-startup          Do not run the start-up definitions\n\
 \    --feedback <mode>     Specify the initial feedback mode. The mode may be\n\
-\                           predefined (silent, concise, normal, or verbose) or\n\
-\                           previously user-defined\n\
+\                            predefined (silent, concise, normal, or verbose) or\n\
+\                            previously user-defined\n\
 \    -q                    Quiet feedback.  Same as: --feedback concise\n\
 \    -s                    Really quiet feedback.  Same as: --feedback silent\n\
 \    -v                    Verbose feedback.  Same as: --feedback verbose\n\
@@ -189,6 +189,10 @@
 \    -X                    Print help on non-standard options\n
 help.usage.x = \
 \    --add-exports <module>/<package>   Export specified module-private package to snippets\n\
+\    --execution <spec>                 Specify an alternate execution engine.\n\
+\                                         Where <spec> is an ExecutionControl spec.\n\
+\                                         See the documentation of the package\n\
+\                                         jdk.jshell.spi for the syntax of the spec\n\
 \    \n\
 \These options are non-standard and subject to change without notice.\n