A more thorough explanation:

Definition: Further assurance refers to a covenant in a warranty deed where the grantor promises to execute any document that may be required in the future to perfect the title that the original deed purported to transfer.

Examples:

• When John sold his house to Jane, he included a further assurance clause in the warranty deed, promising to provide any additional documents needed to ensure that Jane had clear title to the property.
• In a business contract, if one party is unsure about the other party's ability to fulfill their obligations, they may request further assurance in the form of a bond or proof of income.

The examples illustrate how further assurance is a promise to provide additional documents or guarantees to ensure that a transaction is completed successfully and that all parties involved are confident in the outcome.