# contents
.. contents::
How to write filters
--------------------
[Howto? block whitlisted spyware](https://github.com/easylist/easylist/issues/4529)
## Url to source
https://help.eyeo.com/en/adblockplus/how-to-write-filters
[Click here to activate in adBlockPlus](https://subscribe.adblockplus.org/?location=https://anonymousposter.gitlab.io/ublockorigin-rules/blockrules.txt&title=My%20Privacy%20DNS)