Making irssi refresh work with tmux

The first time you try using irssi with tmux you might notice that on screens larger than 40 rows the refresh functionality does not work. This is a known not-really-an-issue tmux requires a particular term and is quite clear about it in the docs (if you read them I did not). Found the solution here, when you start tmux set the term for it correctly:

alias irssi='TERM=screen-256color irssi'