README.md in capistrano3-puma-5.0.2 vs README.md in capistrano3-puma-5.0.3

@@ -114,10 +114,22 @@
 To generate unit file use:
 ```
 cap production puma:systemd:config puma:systemd:enable
 ```
 
+To use customize environment variables
+
+```ruby
+  set :puma_service_unit_env_file, '/etc/environment'
+```
+```ruby
+  set :puma_service_unit_env_vars, %w[
+      RAILSE_NV=development
+      PUMA_METRICS_HTTP=tcp://0.0.0.0:9393
+  ]
+```
+
 ### Multi bind
 
 Multi-bind can be set with an array in the puma_bind variable
 ```ruby
   set :puma_bind, %w(tcp://0.0.0.0:9292 unix:///tmp/puma.sock)
@@ -156,9 +168,12 @@
     set :puma_preload_app, false
     set :puma_daemonize, false
     set :puma_plugins, []  #accept array of plugins
     set :puma_tag, fetch(:application)
     set :puma_restart_command, 'bundle exec puma'
+    set :puma_service_unit_name, "puma_#{fetch(:application)}_#{fetch(:stage)}"
+    set :puma_service_unit_env_file, nil
+    set :puma_service_unit_env_vars, []
 
     set :nginx_config_name, "#{fetch(:application)}_#{fetch(:stage)}"
     set :nginx_flags, 'fail_timeout=0'
     set :nginx_http_flags, fetch(:nginx_flags)
     set :nginx_server_name, "localhost #{fetch(:application)}.local"