Snippets.md in mailgun-ruby-1.0.2 vs Snippets.md in mailgun-ruby-1.0.3

@@ -81,9 +81,10 @@
 ```ruby
 bm_obj = Mailgun::BatchMessage.new
 
 # Build message using Message Builder
 bm_obj.set_from_address :from, "[e-mail]", {'first' => 'Sending', 'last' => 'User'}
+bm_obj.set_message_id("<[e-mail]>") # optional
 bm_obj.set_subject :subject, "This is the subject!"
 bm_obj.set_text_body :text, "This is the text body."
 
 # Loop and add unlimited recipients (batch jobs will fire when thresholds reached)
 bm_obj.add_recipient :to, "[e-mail]"
\ No newline at end of file