> For the complete documentation index, see [llms.txt](https://docs.dataloy.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.dataloy.com/release-8.28/voyage-management-system/step-by-step-guides/chartering/market-indices/maintain-market-indices-and-market-index-values.md).
# Maintain Market Indices and Market Index Values
## Overview tab
The overview tab gives you access to the details of the market index, as well as a list of spot and current forward-curve market index values. You can read more about the grid's functionalities [here](https://app.gitbook.com/o/-LhoT2vqihl0pYiCeolt/s/BOXrRRsrTBcdaVWqOIzi/voyage-management-system/step-by-step-guides/data-grids).
For regular market indices, there is the option to turn it into a [Protected Market Index](/release-8.28/voyage-management-system/step-by-step-guides/chartering/market-indices/protected-market-indices.md), while a [Custom Market Index](/release-8.28/voyage-management-system/step-by-step-guides/chartering/market-indices/custom-market-indices.md) will in its place have a lumpsum adjustment field.
The Last Updated field shows the date of when the most recently updated market index value was updated.
## **Historical Forward Curve tab**
This tab displays a list of all market index values for the index that are categorized as Historical Forward. Read more about the different types of market index values [here](/release-8.28/voyage-management-system/step-by-step-guides/chartering/market-indices/market-index-value-types.md).
## Deleting a Market Index
A Market Index must first be *disabled*. Click the  button in the top right corner to open the secondary actions. Choose the "Disable" option. Click the  button again, and then choose the "Delete" option. A confirmation modal will also show up, click Delete.
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## 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://docs.dataloy.com/release-8.28/voyage-management-system/step-by-step-guides/chartering/market-indices/maintain-market-indices-and-market-index-values.md?ask=
```
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.