# tmux.Session.AppendOption

- **Module:** tmux.Session
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-go/blob/5f808882015a975a65acc7f9da5b3ff0d5cbdc91/tmux/option_mutation.go#L203
- **Page:** https://libtmux.org/reference/go/tmux-session-appendoption/

```
tmux.Session.AppendOption(ctx: context.Context, name: string, value: string, options: SetOptionOptions) -> error
```

AppendOption appends to a session option at this stable session target without refreshing models. Completed failures are secret-safe option errors; cancellation does not prove the append was not accepted.