Op-Amp High Pass Filter - Cutoff Frequency derivation
That's right, the -3dB point is at R1.C 1/radians, or 1/2.pi.R1.C Hz.

Were you expecting R2 to figure in there?

From inspection, you can notice that the inverting input is at a virtual ground because of R2. This effectively isolates R1 from R2, so only R1 and C affect the frequency response.