Tell customers to request hooks.

doc/git_hooks/git_hooks.md

 # Git Hooks
 
-Sometimes you need additional control over pushes to your repository. 
-GitLab already offers protected branches. 
-But there are cases when you need some specific rules like preventing git tag removal or enforcing a special format for commit messages. 
+Sometimes you need additional control over pushes to your repository.
+GitLab already offers protected branches.
+But there are cases when you need some specific rules like preventing git tag removal or enforcing a special format for commit messages.
 GitLab Enterprise Edition offers a user-friendly interface for such cases.
 
-Git hooks are defined per project so you can have different rules applied to different projects depends on your needs. 
-Git hooks settings can be found at Project settings -> Git Hooks page. 
+Git hooks are defined per project so you can have different rules applied to different projects depends on your needs.
+Git hooks settings can be found at Project settings -> Git Hooks page.
 
+## New hooks
+
+If you are a subscriber and need a hook that is not there yet we would be glad to add it for free, please contact support to request one.
 
 ## How to use
 
@@ -16,12 +19,12 @@ Let's assume you have the following requirements for your workflow:
 * every commit should reference a reference JIRA issue. For example: `Refactored css. Fixes JIRA-123. `
 * users should not be able to remove git tags with `git push`
 
-All you need to do is write simple regular expression that requires mention of JIRA issue in a commit message. 
-It can be something like this `/JIRA\-\d+/`. 
-Just paste regular expression into commit message textfield(without start and ending slash) and save changes. 
-See the screenshot below: 
+All you need to do is write simple regular expression that requires mention of JIRA issue in a commit message.
+It can be something like this `/JIRA\-\d+/`.
+Just paste regular expression into commit message textfield(without start and ending slash) and save changes.
+See the screenshot below:
 
 ![screenshot](git_hooks.png)
 
-Now when a user tries to push a commit like `Bugfix` - their push will be declined. 
+Now when a user tries to push a commit like `Bugfix` - their push will be declined.
 And pushing commit with message like `Bugfix according to JIRA-123` will be accepted.
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