# Customize general fields

You can add an arbitrary number of tabs to the entry editor. These will be present for all entry types. To customize these tabs, go to **Options → Preferences → Custom editor tabs**.

You specify one tab on each line. The line should start with the name of the tab, followed by a colon (:), and the fields it should contain, separated by semicolons (;).

For example:

```csv
General:url;keywords;doi;pdf
Abstract:abstract;annote
```

will give one tab named "General" containing the fields *url*, *keywords*, *doi* and *pdf*, and another tab named "Abstract" containing the fields *abstract* and *annote*.

It does not matter how you capitalise your field names. In the entry editor's tabs, normally fields' first letter is capitalised, i.e. *abstract* is represented as *Abstract*, *KEYwords* would be represented as *Keywords* (*DOI*, *ISBN*, *URL* are exceptions in that all letters are capitalised). In the bibtex code, all field names use lower case: *KEYwords* is *keywords* in the entry's bibtex code.