changing a log message of a public change set (evolve)

[Uwe Brauer]

Hi

When pulling from a repository I found out that my collaborator forgot
to provide a log message.

I could do

 hg up that-change set
 hg phase -d -f
 hg amend -u "User <user at foo.bar>" -e

Edit and commit. 

But when I push I would create a new head that my collaborator has to
merge, right?

I am not sure whether this workflow is recommendable.

Any suggestions?

Regards

Uwe Brauer