antlr-indent-comment

antlr-indent-comment is a variable defined in `antlr-mode.el'.
Its value is

tab

Documentation:
Non-nil, if the indentation should touch lines in block comments.
If nil, no continuation line of a block comment is changed. If t, they
are changed according to `c-indentation-line'. When not nil and not t,
they are only changed by M-x antlr-indent-command.

You can customize this variable.