---
title: "Comment | Technical Reference"
slug: "comment"
description: "Find the technical reference section for the comment unit."
tags: ["1D river modelling", "error messages and diagnostics"]
updated: 2022-09-21T11:35:21Z
published: 2022-09-21T11:35:21Z
canonical: "help.floodmodeller.com/comment"
stale: true
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.floodmodeller.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Comment

The Comment Unit allows comments to be placed between hydraulic units to aid documentation within the data file.

## Theory and Guidance

### General

Comments can be included within the data file using the keyword COMMENT.

COMMENTS can be placed between hydraulic unit data to aid documentation of the data file. COMMENTS cannot be positioned before the end of the general system parameters data or within the initial conditions. A COMMENT is not a hydraulic unit and should therefore not be included in the number of nodes in the model given in line 2 of the data file.

## Data

| Field in Data Entry Form | Description | Name in Datafile |
| --- | --- | --- |
| Comment | required comment (anything you like except Flood Modeller keywords should not be used at the start of a line, e.g. don't start a line with RIVER) | text |

## Datafile Format

### General

Line 1 : keyword 'COMMENT'

Line 2 : n1

Line 3 to Line 2 + n1 : Text

where n1 is the number of lines of ensuing comments, and text is the required comment (anything you like except Flood Modeller keywords should not be used at the start of a line, e.g. don't start a line with RIVER)

### Example

```none
COMMENT
2
Data for node U127 have been increased by 10% 
This is for sensitivity test purposes
```