# tmux.Session.SetMessageFormat

- **Module:** tmux.Session
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-go/blob/52968a3181c1c9e6d1b26c565d4b170968ae61c0/tmux/option_generated.go#L5544
- **Page:** https://libtmux.org/en/go/latest/reference/tmux-session-setmessageformat/

```
tmux.Session.SetMessageFormat(ctx: context.Context, value: string) -> error
```

SetMessageFormat stores the "message-format" session option as string (tmux 3.7 or later). Read it with [SessionOptionValues.MessageFormat] from [Session.Options]; [Session.UnsetOption] restores inheritance or the global default.