Priyanka, who essayed the role of the world boxing champion M.C. Mary Kom in the film, took to Twitter to "thank everyone".
"Wow..It's #OneYearOfMaryKom! This time last year we were a train moving full throttle...thank you everyone @OmungKumar," the "Gunday" actress tweeted on Saturday.
Kumar replied to Priyanka's tweet by calling it a "fabulous journey".
"Yes one year, what a fabulous journey," he wrote.
The biopic is also starred Darshan Kumar.