Histone has post-translational modification by all /except
Amino-terminal tails of histones are available for regulatory covalent modification by Acetylation, phosphorylation, ADP-ribosylation, methylation, monoubiquitylation and sumoylation.

Note:- Sumoylation means conjugation with SUMO (i.e. small ubiquitin-related modifier).
Acetylation
methylation
Phosphorylation
Glycosylation