diff --git a/Dynamic-filtering:-default-deny.md b/Dynamic-filtering:-default-deny.md
index 12916a1..6756183 100644
--- a/Dynamic-filtering:-default-deny.md
+++ b/Dynamic-filtering:-default-deny.md
@@ -10,6 +10,8 @@ Default-deny is an awesome blocking mode for whoever is ready for the task of ha
 ![Default-deny](https://raw.githubusercontent.com/gorhill/uBlock/master/doc/img/df-dd-01.png)<br>
 <sup>Default-deny engaged, through the default blocking of 3rd-party network requests.</sup>
 
+The 3rd-party status of a network request is determined as follow: the domain of the network request must match the domain of the web page. The domain information is extracted as per the official [Public Suffix List](https://publicsuffix.org/).
+
 The benefits of using default-deny are plenty:
 
 - Faster page load