- Upload the "post-revision" directory to the plugins directory.
- Go to the plugins setting page and activate "Post Revision".
- Go to Settings --> Post Revision --> Fill the Custom heading, Asc or Des order and then select the font and background color
- Users can able to view "Reason for Last Update" in Posting area and update it.
For More Information : http://buffercode.com/post-revision-wordpress-plugin/