&productName; lets you jump from your check-in comment to an issue in your task tracker.
You only need to define issue navigation patterns on the Version Control | Issue Navigation settings/preferences page:
When you commit a changelist, and provide the commit message, make sure it matches one of your issue navigation patterns. Later, when you browse through the changelists in the repository, such comments turn into hyperlinks:
Clicking a hyperlink brings you directly to an issue in your task tracker.