Hi.

At @item markers
  , in @subsection Buffer Internals
  , in @section Object Internals
  , in internals.texi
  , in lispref manual, the manual says,

This is actually a single marker, and successive elements in its marker
@code{chain} are the other markers referring to this buffer text.

http://git.savannah.gnu.org/cgit/emacs.git/tree/doc/lispref/internals.texi#n2023

But I think @code{chain} should be markup-ed with @dfn, @emph, or quoted
with ` and '.

(Or "chain" is some kind of symbol defined in source files? I can't find
it.)

Thanks.