  The radiation-loud and radiation-quiet anti-glitches in magnetar 1E 2259+586
are discussed together. It is shown that the 2019 radiation-quiet anti-glitch
in 1E 2259+586 is not constraining, because its amplitude is 2.5 smaller than
the previous radiation-loud anti-glitch. We note that magnetars with high X-ray
luminosity and low rotational energy loss rate are more likely to show
anti-glitches. Anti-glitchers and radio-emitters of magnetars occupy opposite
corner on the luminosity vs. rotational energy loss rate diagram. By
introducing the X-ray luminosity parameter and the activity parameter, we try
to characterize this trend quantitatively. A general picture of magnetar
anti-glitch is given.
