Add a specific tag to EC2 instances?

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COUNTER=0
for instance_id in `aws ec2 describe-instances --query "Reservations[*].Instances[*].{Instance:InstanceId}"  --filters "Name=tag:Name,Values=*<Common_name>*"  --output text --region <region_name>`
do
let COUNTER++
printf $COUNTER;
echo ". Setting up tag for the instance "$instance_id;
aws ec2 create-tags --resources $instance_id --region <region_name>  --tags "Key"="<key_that_needs_to_be_added>","Value"="<value_that_needs_to_be_added>" ;
done;

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