The phrase "addition to the post" is not correct in standard written English.
It seems to be an incomplete expression and may be intended to convey the idea of adding something to a post or document.
Example: "In addition to the post, I would like to include some additional resources for further reading."
Alternatives: "in addition to the article" or "as an addition to the post".
In addition to the Post contingencies, our family had elaborate plans.
In addition to the post office, several churches and social service organizations in Manhattan allow the homeless to collect mail.
In addition to the post of clubhouse manager, he also held the positions of equipment manager and traveling secretary.
Veterans typically receive benefits through the U.S. Department of Veterans Affairs, in addition to the Post 9/11 GI Bill programs.
In addition to the post at Ras Doumeira, Eritrean forces had also recently built a coastal road from the port of Assab to Doumeira, and had begun to reclaim the waterfront, in an apparent attempt to construct some sort of port facility, he said.
In addition to the post itself, extracted information included the thread title, date of post, and username, as well as gender, age, location, and the year of AS diagnosis, if available.
In addition to the post-election violence in Paris, incidents were reported in Lyon, in the southeast, and Toulouse, in the south.
In addition to the post-doctoral positions I'm about to list, there are also many opportunities outside of the standard track in companies, finance, education, and more.
The highest bidder gets the right to negotiate a contract with Darvish, with that money paid in addition to the posting bid.
Other products that will be new to the market in addition to the Post-it products are devices from ScanSnap and Adonit.
In addition to the post-session questionnaire, on-session monitoring of the viewer's comfort, e.g., with a slider command would be valuable, for example, to monitor the onset of discomfort.
