public void setReference(String reference) {
        this.reference = reference;
    }
<p>
The reference rule from the primary security group of the Firewall Manager policy.
</p>

@param reference
       The reference rule from the primary security group of the Firewall Manager policy.
aws-java-sdk-fms/src/main/java/com/amazonaws/services/fms/model/PartialMatch.java