Link to Case from JIRA Issue Comment
If a Case Number is known, it is now possible to link a JIRA Issue to that Case from within the Issue, by using a special #linktocase tag in a Comment.
This requires the Case Feed to be enabled
ex: #linktocase #00010669
The above tags in an Issue Comment will result in the posting of a corresponding tag (#linktojira) in the Feed of the Case referenced above which executes the link action to associate the Case with the JIRA issue.