Update installation.md

doc/install/installation.md

@@ -460,9 +460,11 @@ GitLab-Pages uses [GNU Make](https://www.gnu.org/software/make/). This step is o
 ### Initialize Database and Activate Advanced Features
 
     sudo -u git -H bundle exec rake gitlab:setup RAILS_ENV=production
-
     # Type 'yes' to create the database tables.
     
+    # or you can skip the question by adding force=yes
+    sudo -u git -H bundle exec rake gitlab:setup RAILS_ENV=production force=yes
+
     # When done you see 'Administrator account created:'
 
 **Note:** You can set the Administrator/root password and e-mail by supplying them in environmental variables, `GITLAB_ROOT_PASSWORD` and `GITLAB_ROOT_EMAIL` respectively, as seen below. If you don't set the password (and it is set to the default one) please wait with exposing GitLab to the public internet until the installation is done and you've logged into the server the first time. During the first login you'll be forced to change the default password.