Is it true that is there a sequel to saturday night fever based on the following text?

Staying Alive is a 1983 American dance film starring John Travolta as dancer Tony Manero, with Cynthia Rhodes, Finola Hughes, Joyce Hyser, Julie Bovasso, and dancers Viktor Manoel and Kevyn Morrow. It is a sequel to 1977's Saturday Night Fever. The film was directed by Sylvester Stallone, who also co-produced and co-wrote the film with the original Saturday Night Fever producer and writer, Robert Stigwood and Norman Wexler, respectively. This is, along with Homefront, one of only two films which Stallone wrote without being the star (although he does have a cameo appearance). The choreography was done by Dennon and Sayhber Rawles.
yes