The 49ers announced they signed reserve OT Alex Boone to a four-year extension on Thursday. Boone has played in 12 games this season.
"He really is a great example of what hard work, dedication and focus can do to further a young player's career," GM Trent Baalke said. "The 49ers are very happy for Alex and look forward to him capitalizing on this opportunity."
The Ohio State alum joined the 49ers as an undrafted free agent last season. According to NFL Network's Jason La Canfora, Boone received a $1.7 million signing bonus late last month and then added four years to the deal.