FWEB supports a variety of commenting styles borrowed from C, C++, and TeX. For more discussion, see Comments.
@/*: Begin long verbatim comment
The following comment is copied to the tangled output. (By default,
comments are not copied.) If you desire all comments to be so copied,
use -v. See -v.
@//: Begin short verbatim comment
See the discussion of @/* in AT//.