First, they announced that LB Brandon Siler was placed on injured reserve, ending his season. The reported injury is a torn Achilles which, as ESPN's John Clayton pointed out, is the 11th Achilles' injury this year. Siler's agent made the announcement on Twitter Tuesday night so we've known about this for a couple of days. He was signed to compete with LB Jovan Belcher and play on special teams but he won't get that opportunity this year.
Second, they announced that TE Anthony Becht was signed, which we also knew about. Pro Football Talk reported it on that this morning and Becht confirmed the news via Twitter. Becht comes in as a big blocking tight end. He hasn't played in a year but with his experience -- and we know how much the Chiefs love blocking tight ends -- I wouldn't be shocked to see him make the roster. He'll be competing with TE Tony Moeaki, TE Leonard Pope, TE Charlie Gantt, TE Jake O'Connell and TE Cody Slate. I'd say Moeaki is the only lock in that group so Becht will get his opportunity.
So those are your personnel moves for the day. Siler's placement on IR opened up a roster spot, which Becht filled, so the total roster numbers stay the same.