The British Broadcasting Corporation issued an apology to its viewers after some complained about the channel’s recent coverage of Kate Middleton.

The BBC said in a summary of its statement issued last week that it “received complaints from people unhappy that we didn’t use the Princess of Wales’s correct title during our coverage of Armistice Day.”

“During our coverage of memorials to commemorate Armistice Day we mistakenly referred to Catherine, Princess of Wales as Kate Middleton; these were errors during hours of live broadcasting for which we apologise,” the BBC said in the full statement.

“Throughout our Armistice Day coverage more broadly, we referred to Catherine by her correct title,” the network added.

Many publications, including this one, refer to the royal as both “Kate Middleton” and the Princess of Wales. The royal herself often refers to herself as Catherine or “C” when she signs personalized messages, like tweets.