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