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# Pivotal Tracker service **(FREE)**
This service adds commit messages as comments to Pivotal Tracker stories.
Once enabled, commit messages are checked for square brackets containing a hash mark followed by
the story ID (for example, `[#555]`). Every story ID found gets the commit comment added to it.
You can also close a story with a message containing: `fix [#555]`.
You can use any of these words:
-`fix`
-`fixed`
-`fixes`
-`complete`
-`completes`
-`completed`
-`finish`
-`finished`
-`finishes`
-`delivers`
Read more about the
[Source Commits endpoint](https://www.pivotaltracker.com/help/api/rest/v5#Source_Commits) in