---
title: What is the guidance for columns marked as O (Optional)?
description: Data for optional columns should be supplied when the source data contains a value.
url: "https://civhc.org/docs/what-is-the-guidance-for-columns-marked-as-o-optional/"
updated: "2017-08-11"
category: Submissions
---

# What is the guidance for columns marked as O (Optional)?

Data for optional columns should be supplied when the source data contains a value.