What constitutes a waiver regarding a final settlement?

Question Details: I have been sent a letter by my workers comp insurance company. Does the following letter mean that I agree to anything other than having the $5000 deducted from a final settlement. It isn't a final settlement right? "As you know, X is the third party administrator for (my company). Please be advised that (my company) has agreed to advance $5000 toward the settlement of your worker's compensation claim. The $5,000 will be deducted from the total settlement that you will receive as a result of the injury to your shoulder. Please sign your name at the bottom of this letter to acknowledge this advancement and return this letter to me in the enclosed self-addressed stamped envelope".

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