clarify that the section is about web-based-clients

A link to wikipedia's full list of clients is already present above

README.md

@@ -257,7 +257,7 @@ _CalDAV or CardDAV servers_
 - [SabreDAV](http://sabre.io/) - Open source CardDAV, CalDAV, and WebDAV framework and server. ([Source Code](https://github.com/sabre-io/dav)) `MIT` `PHP`
 - [Xandikos](https://www.xandikos.org/) - Open source CardDAV, CalDAV and WebDAV server with minimal administrative overhead, backed by a Git repository. ([Source Code](https://github.com/jelmer/xandikos)) `GPL-3.0` `Python`
 
-_CalDAV or CardDAV clients._
+_CalDAV or CardDAV web-based clients._
 
 - [AgenDAV](http://agendav.org/) - Multilanguage CalDAV web client with a rich AJAX interface and shared calendars support. ([Source Code](https://github.com/agendav/agendav)) `GPL-3.0` `PHP`
 - [InfCloud](https://www.inf-it.com/open-source/clients/infcloud/) - Open source CalDAV/CardDAV web client implementation. ([Demo](https://www.inf-it.com/infcloud/), [Source Code](https://www.inf-it.com/InfCloud_0.13.1.zip)) `AGPL-3.0` `Javascript`