diff --git a/docs/INSTALL-email.md b/docs/INSTALL-email.md
index 34172112076..e5e708ed8d7 100644
--- a/docs/INSTALL-email.md
+++ b/docs/INSTALL-email.md
@@ -5,7 +5,7 @@ After following INSTALL-ubuntu.md your mailer settings should still be set (in
 
 ```ruby
   config.action_mailer.delivery_method = :sendmail
-  config.action_mailer.sendmail_settings = {arguments: '-i}
+  config.action_mailer.sendmail_settings = {arguments: '-i'}
 ```
 
 That's great. Leave that there as we're going to try to get the mail to postfix