Create a new pipeline a new block called description. The intention is this can be added within a pipeline or stage block to help describe what the pipeline or stage does. The contents of this should also appear in the console logs. I see a lot of people using echo to achieve this now which is fine, but I think have a description block fits in nicely with the concept of declarative pipelines.

pipeline {
    description { 'CICD pipeline to deploy application' }
    agent any 
    stages {
        stage('Build') { 
            description { 'Builds jar file and docker image' }
            steps {
                // 
            }
        }
       ...
    }
}