  We present observations of the intranight brightness variability of CR Boo, a
member of the AM CVn stars group. The observational data are obtained with the
2m telescope of the Rozhen National Astronomical Observatory and the 60 cm
telescope of the Belogradchik Observatory, Bulgaria, in BVR bands. We report
the appearance of superhumps, with an amplitude from 0.08 to 0.25 mag, when the
maximum brightness reaches the magnitude 14.08 in the V band, and 14.13 in the
B band. A secondary maximum of each superhump is detected with the same
periodicity as the superhumps: Psh = 24.76 - 24.92 min. In our results, the
post maxima are shifted in time from $\approx 7.62$ min to $\approx 16.35$ min
in different nights, with an amplitude of $\approx 0.06 - 0.09$ mag and an
amplitude difference of $\approx 0.035$ mag towards the superhumps' maximum. We
find a correlation of the post maxima with the accretion processes at the outer
side of the disc.
