> ## Documentation Index > Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt > Use this file to discover all available pages before exploring further. # Use Header and Footer elements to detect the beginning and the end of a document > Detect the first and last pages of multi-page documents with Header and Footer elements, which speed up FlexiLayout matching and improve detection. To detect the beginning and the end of a document, use **Header** and **Footer** elements. These are compound elements and must be placed at the beginning of the branch of elements. In the tree of elements, **Header** elements are marked with Header element icon and **Footer** elements are marked with Footer element icon. The **Header** element is positioned on the first page of the document and may not occur on any of the subsequent pages. Select a **Header** element that uniquely identifies the documents described by the FlexiLayout. The **Footer** element is positioned on the last page of the document and may not occur on the preceding pages. The **Header** and **Footer** elements are part of the FlexiLayout and their hypotheses may be used to search for other elements. When applying a multi-page FlexiLayout, the **Header** and **Footer** elements are used to detect the first and last pages of the document respectively. Using **Header** and **Footer** elements greatly improves document detection and speeds up the FlexiLayout matching process. Be sure to use these elements whenever possible. ## Related topics * [Header and Footer](/flexi-capture/fls/template/elements-header-footer) * [Match a multi-page FlexiLayout](/flexi-capture/fls/template/multipage-matching)