diff --git a/contrib/completion/zsh/_docker b/contrib/completion/zsh/_docker
index 2a4e149782..2ee7eaf64d 100644
--- a/contrib/completion/zsh/_docker
+++ b/contrib/completion/zsh/_docker
@@ -1684,6 +1684,7 @@ __docker_service_subcommand() {
                 $opts_create_update \
                 "($help)*--container-label=[Container labels]:label: " \
                 "($help)*--env-file=[Read environment variables from a file]:environment file:_files" \
+                "($help)--hostname=[Service containers hostname]:hostname: " \
                 "($help)--mode=[Service Mode]:mode:(global replicated)" \
                 "($help)--name=[Service name]:name: " \
                 "($help -): :__docker_complete_images" \