Faces don't work in overlays

[Pascal Wassong]

Hello,

Below is part of a elisp code :

      (let ((eol-overlay (make-overlay arg (1+ arg))))
        (overlay-put eol-overlay 'after-string "some text")
        (overlay-put eol-overlay 'face 'font-lock-comment-face))

I create an overlay and want to show it in a specific face.  This does not 
work.

Could anybody help me, please ?

I found a message saying approximately the same on the gnu.emacs.bug 
newsgroup (Overlay problems, 04 may 2001) but there was no answer.

In GNU Emacs 20.7.1 (i386-*-nt5.0.2195)
 of Tue Jun 13 2000 on buffy
configured using `configure NT'


Pascal Wassong