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When I worked with cvs and Subversion I remember a resource where we put some notes in the archives and each time we did one commit these data were updated. In general the data referred to the date, author and number of the commit. It was something like the example below
/*
* $Author: joazinho $
* $Rev: 153 $
* $LastChangedDate: 2016-04-15 17:32:15 -0300 (Fri, 15 Apr 2016) $
*/
In Git something similar for me to get the branch / tag, hash, etc... that is native.