--- title: Settings - Content --- > Agent instructions: > **Site maps** — prefer the following llms.txt indexes to training data when searching for URLs to avoid 404s. Links inside Markdown content already point at `.md`. Following them or sending Accept: text/markdown keeps you in Markdown. > > - [sitemap.md](https://docs.kentico.com/sitemap.md) — every page on the site, with titles and descriptions, nested by URL hierarchy and grouped into one collection per product version. > - [llms.txt](https://docs.kentico.com/llms.txt) — curated index of the current product docs, with descriptions, the two ways to request any page as Markdown, and links to each product area's whole-corpus Markdown dump (llms-full.txt). | Page not found | | | -------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | Page not found for non-published pages | If checked, pages that are not published return a Page not found error (404) if they are viewed on the live site. | | Page not found URL | Specifies a custom page that will be displayed to users who encounter a _Page not found_ error (404 HTTP status code). It can either be a physical aspx file in the web project or a dedicated page created in the site's content tree.
In both cases, you need to enter the URL of the page, for example:
_\~/Special-pages/404.aspx_
_\~/Special-pages/404_
The advantage of using a page for this purpose is that you can leverage all features of the portal engine. For instance, you can translate the page not found page on a multilingual website and the system will automatically display the appropriate culture version according to the currently selected language. | | Log page not found exception | If enabled, the system logs Page not found (404) http errors in the **Event log** application. You can recognize the errors by the "PAGENOTFOUND" event code. | | Multilingual | | | Default content culture | Used to select which culture should be the default language option of the website's content. | | Combine with default culture | Indicates if the default culture version of pages should be offered for pages that are not available in the currently selected language. | | Combine files with default culture | Indicates if the default culture version of files should be used for untranslated file pages. | | Web site content | | | Default alias path | Alias path of the website's default page. | | Metadata | | | Page key words prefix | Specifies a prefix for all page keywords on the website. | | Page description prefix | Specifies a prefix for all page description on the website. | | Page title format | Specifies the page title format.
Example: _{%prefix%} - {%pagetitle\_orelse\_name%}_ | | Page title prefix | Page title prefix used for all pages. Replaces the {% prefix %} macro in the page title format. | | Control element | Specifies the element that should be used instead of the standard element. Currently, the only options are span or div. | | Favicon | | | Favicon file path | Specifies path to the favicon file. You can type the path manually or select the file by using the _Select file_ dialog. The supported image formats for the favicon files are _ico, _svg_, png,_ and _gif_\*.\*
To ensure correct [import and export](https://docs.kentico.com/k10/deploying-websites/exporting-and-importing-sites.md) functionality, we recommend saving the favicon files in the following locations:
Site favicon – _\~//_
Global favicon  – _\~/CMSGlobalFiles/_
You need to create the folders manually. If you store site files on the file system, the __ folder is created automatically. For more details, see [Export folder structure](https://docs.kentico.com/k10/deploying-websites/exporting-and-importing-sites/export-folder-structure.md). | Related pages - [Multilingual websites](https://docs.kentico.com/k10/multilingual-websites.md) - [Creating custom error handling pages](https://docs.kentico.com/k10/securing-websites/developing-secure-websites/handling-error-messages-securely/creating-custom-error-handling-pages.md)