Definition: An endorsement is a written document attached to an insurance policy that modifies the policy by changing the coverage afforded under the policy. An endorsement can add coverage for acts or things that are not covered as a part of the original policy and can be added at the inception of the policy or later during the term of the policy.

Also Known As: Rider, addendum, attachment.

Examples: I will be working for D106 and I will need an additonal insured endorsement naming them as an additional insured on my policy.