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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
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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
`terminal_total_difficulty` .
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Except under exceptional scenarios, this setting is expected to not be used, and `terminal_total_difficulty` will operate with [default functionality ](./fork.md#initializing-transition-store ). Sufficient warning to the user about this exceptional configurable setting should be provided.
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[here ](fork.md#initializing-transition-store ).
