  We present the first results of a search for the presence of rapid optical
variability in a sample of five Narrow-Line Seyfert 1 galaxies. We find clear
evidence of rapid variability for IRAS 13224-3809 with variations occurring on
time scales of an hour. However, the results are less conclusive for the other
four sources in our sample, Markarian 766, PG 1244+026, PG 1404+226 and
Arakelian 564. While there are several instances among these latter objects
where there is a hint that variability may be present, IRAS 13224-3809 provides
the only conclusive evidence of rapid optical variability detected to date.
