1 files changed, 13 insertions, 4 deletions
diff --git a/doc/install/installation.md b/doc/install/installation.md
index 1f65e3415d1..a8064ae046e 100644
--- a/doc/install/installation.md
+++ b/doc/install/installation.md
@@ -139,8 +139,8 @@ Then select 'Internet Site' and press enter to confirm the hostname.
 
 The Ruby interpreter is required to run GitLab.
 
-**Note:** The current supported Ruby (MRI) version is 2.3.x. GitLab 9.0 dropped
-support for Ruby 2.1.x.
+**Note:** The current supported Ruby (MRI) version is 2.5.x. GitLab 11.6
+  dropped support for Ruby 2.4.x.
 
 The use of Ruby version managers such as [RVM], [rbenv] or [chruby] with GitLab
 in production, frequently leads to hard to diagnose problems. For example,
@@ -345,11 +345,15 @@ cd /home/git
 
 ```sh
 # Clone GitLab repository
-sudo -u git -H git clone https://gitlab.com/gitlab-org/gitlab-ce.git -b 11-7-stable gitlab
+sudo -u git -H git clone https://gitlab.com/gitlab-org/gitlab-ce.git -b X-Y-stable gitlab
 ```
 
+Make sure to replace `X-Y-stable` with the stable branch that matches the
+version you want to install. For example, if you want to install 11.8 you would
+use the branch name `11-8-stable`.
+
 CAUTION: **Caution:**
-You can change `11-7-stable` to `master` if you want the *bleeding edge* version, but never install `master` on a production server!
+You can change `X-Y-stable` to `master` if you want the *bleeding edge* version, but never install `master` on a production server!
 
 ### Configure It
 
@@ -691,6 +695,11 @@ sudo nginx -t
 
 You should receive `syntax is okay` and `test is successful` messages. If you receive errors check your `gitlab` or `gitlab-ssl` Nginx config file for typos, etc. as indicated in the error message given.
 
+NOTE: **Note:**
+Verify that the installed version is greater than 1.12.1 by running `nginx -v`. If it's lower, you may receive the error below:
+`nginx: [emerg] unknown "start$temp=[filtered]$rest" variable
+nginx: configuration file /etc/nginx/nginx.conf test failed`
+
 ### Restart
 
 ```sh