# Insert and append

{% hint style="success" %}
Run this example using its test data from within [FlightPath Data](https://www.flightpathdata.com/).
{% endhint %}

```
~
   This csvpath updates the test file data to have a processing date at the 0th header
   and a "modified by" header at the end of the line.

   id: insert and append

   test-data:examples/headers/projects.csv
~
$[*][

	insert( 0, "processing date", now() )
         append( "modified by", "CsvPath", yes() )

	last.nocontrib() -> print("See the Matches tab for the new column at the end of every line")
]
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://www.csvpath.org/getting-started/the-flightpath-data-examples/headers/insert-and-append.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.