# tmux.NotificationOptions.BacklogBytes

- **Module:** tmux
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** attribute
- **Source:** https://github.com/libtmux/libtmux-go/blob/2de249b600d65218ee8b8fdc07c6b2b919242151/tmux/notification_stream.go#L58
- **Page:** https://libtmux.org/en/go/latest/reference/tmux-notificationoptions-backlogbytes/

BacklogBytes bounds the notifications this stream holds while the caller is not reading, counting each notification's text and a small fixed overhead. Zero means 16 MiB. Once a notification would cross the bound, reads return the queued prefix and then ErrControlNotificationOverflow. A larger bound trades memory for headroom on a chatty pane; a smaller one makes a slow reader fail sooner. It may not be below 64 KiB.