"hg graft" with "--log" doesn't annotate the log message

[Jesus Cea]

"hg help graft" says:

"""
     If --log is specified, log messages will have a comment appended of the
     form:

       (grafted from CHANGESETHASH)
"""

I did "hg graft --log -r tip" to merge from another branch, and a "hg 
log" shows the new changeset with the same "summary" message that the 
original in the log. There is no reference at all this being grafted 
changeset.

I am using Mercurial 6.3.2.

Am I using this wrongly?

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