README.md in capistrano3-puma-5.0.4 vs README.md in capistrano3-puma-5.1.0

@@ -30,11 +30,11 @@
 ```ruby
 install_plugin Capistrano::Puma::Daemon  # If you using puma daemonized (not supported in Puma 5+)
 ```
 or
 ```ruby
-install_plugin Capistrano::Puma::Systemd  # if you use SystemD 
+install_plugin Capistrano::Puma::Systemd  # if you use SystemD
 ```
 
 To prevent loading the hooks of the plugin, add false to the load_hooks param.
 ```ruby
     # Capfile
@@ -45,12 +45,12 @@
 ```
 
 To make it work with rvm, rbenv and chruby, install the plugin after corresponding library inclusion.
 ```ruby
     # Capfile
-    
-    require 'capistrano/rbenv'   
+
+    require 'capistrano/rbenv'
     require 'capistrano/puma'
     install_plugin Capistrano::Puma
 ```
 
 ### Config
@@ -121,13 +121,29 @@
 ```ruby
   set :puma_service_unit_env_file, '/etc/environment'
 ```
 ```ruby
   set :puma_service_unit_env_vars, %w[
-      RAILSE_NV=development
+      RAILS_ENV=development
       PUMA_METRICS_HTTP=tcp://0.0.0.0:9393
   ]
 ```
+
+### Systemd Socket Activation
+
+Systemd socket activation starts your app upon first request if it is not already running
+
+```ruby
+    set :puma_enable_socket_service, true
+```
+
+For more information on socket activation have a look at the `systemd.socket` [man page](https://man7.org/linux/man-pages/man5/systemd.socket.5.html).
+
+To restart the listening socket using Systemd run
+```
+cap puma:systemd:restart_socket
+```
+This would also restart the puma instance as the puma service depends on the socket service being active
 
 ### Multi bind
 
 Multi-bind can be set with an array in the puma_bind variable
 ```ruby