Sen. John McCain (R-Ariz.) on Thursday clarified that his walking boot is on his right foot, adding that he switched it to his left to "give it a break."

McCain caused confusion when he posted a photo from his daughter Meghan's wedding in which his walking boot was on his left foot. He had previously been seen wearing it on his right foot after he suffered a minor tear in his right Achilles tendon.

Some Twitter users noticed that he was wearing the boot on his other foot and began raising questions about McCain's injury.

McCain took notice of the fallout, and on Thursday took to Twitter to clarify.

McCain has been receiving treatment for brain cancer after announcing in July that he had been diagnosed with glioblastoma, an aggressive form of the disease.

The tendon tear is considered a "normal" side effect of his cancer therapy.