the quantum textbook strikes again

So here I am trying to be studious, reading the quantum textbook in preparation for faggot tree @ quiz. I have come across a gem.

"In this figure, r1 and r2 are the radii of two large adjacent orbits that are separated in energy by an amount dE and ω is the orbital angular frequency of the electron, where ω is approximately constant in a transition between large orbits. (The algebra is simpler if we use angular frequency instead of frequency. Recall that the connection is ω = 2 π f.)" - Modern Physics, Serway/Moses/Moyer, Page 140.

I thought it was funny that they jump from extremely theoretical handwaving to reminding us that ω = 2 π f. Thanks guys. Thanks.