eth2.0-specs/specs/merge/client_settings.md

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# The Merge -- Client Settings
**Notice**: This document is a work-in-progress for researchers and implementers.
This document specifies configurable settings that merge clients are expected to ship with.
### Override terminal total difficulty
To coordinate changes to [`terminal_total_difficulty`](specs/merge/fork-choice.md#transitionstore), clients
should have a setting `--terminal-total-difficulty-override`.
If `TransitionStore` has already been initialized, this just changes the value of
`TransitionStore.terminal_total_difficulty`, otherwise it initializes `TransitionStore` with the specified
`terminal_total_difficulty`.
By default, this setting is expected to not be used and `terminal_total_difficulty` will be set as defined
[here](specs/merge/fork.md#initializing-transition-store).