diff --git a/Dynamic-URL-filtering.md b/Dynamic-URL-filtering.md
index e0aa456..057ae38 100644
--- a/Dynamic-URL-filtering.md
+++ b/Dynamic-URL-filtering.md
@@ -4,4 +4,9 @@ The primary purpose of dynamic URL filtering ("URL filtering") is as a diagnosis
 
 URL filtering has precedence over dynamic filtering and static filtering. See ["Overview of uBlock's network filtering engine"](https://github.com/gorhill/uBlock/wiki/Overview-of-uBlock's-network-filtering-engine) to see where URL filtering fits and to better understand its purpose.
 
-URL filtering is accessible from the logger, i.e. you will create and manage dynamic URL filters through the logger UI.
\ No newline at end of file
+URL filtering is accessible from the logger, i.e. you will create and manage dynamic URL rules through the logger UI.
+
+URL filtering uses _rules_, which resemble dynamic filtering rules, except that the destination hostname is replaced by a URL.
+
+A resource matches a URL filtering rule if the URL of the resource starts exactly with a given URL filtering rule.
+