public void setAppendAccessString(String appendAccessString) {
        this.appendAccessString = appendAccessString;
    }
<p>
Adds additional user permissions to the access string.
</p>

@param appendAccessString
       Adds additional user permissions to the access string.
aws-java-sdk-elasticache/src/main/java/com/amazonaws/services/elasticache/model/ModifyUserRequest.java