Comparison of the optical light curve of GRB 100418A (in black) with other GRB afterglows showing steep rebrightenings. All the light curves have been shifted to a redshift of z = 1 to allow for a direct comparison. When enough data are available the light curves have been fitted with two spline curves, one before the rebrightening and a second one after. When possible the contribution of the host galaxy has been subtracted.