**Example 1: To change the number of instances reserved by an existing capacity reservation** The following ``modify-capacity-reservation`` example changes the number of instances for which the capacity reservation reserves capacity. :: aws ec2 modify-capacity-reservation \ --capacity-reservation-id cr-1234abcd56EXAMPLE \ --instance-count 5 Output:: { "Return": true } **Example 2: To change the end date and time for an existing capacity reservation** The following ``modify-capacity-reservation`` example modifies an existing capacity reservation to end at the specified date and time. :: aws ec2 modify-capacity-reservation \ --capacity-reservation-id cr-1234abcd56EXAMPLE \ --end-date-type limited \ --end-date 2019-08-31T23:59:59Z For more information, see `Modifying a Capacity Reservation <https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/capacity-reservations-using.html#capacity-reservations-modify>`__ in the *Amazon Elastic Compute Cloud User Guide for Linux Instances*.