I'm having a bit of trouble setting up a command for this, any tips? (MySQL)

Update table room to set the value of column roomtype equal to the corresponding id value in the table roomtype. This requires a select * from roomtype; to see what the id value is for each roomDesc. For example, in my database

a. 1 | Critical

b. 2 | Private

c. 3 | Semi-Private

I think i need to use a Join but I'm not sure, any tips are appreciated !