diff --git a/Dynamic-filtering.md b/Dynamic-filtering.md
index 5746f5c..ddeda87 100644
--- a/Dynamic-filtering.md
+++ b/Dynamic-filtering.md
@@ -17,6 +17,7 @@ Columns:
 5. to block 3rd-party `<iframe>` tags.
 
 Whether a request is "1st-party" or "3rd-party" to a page (or frame) is derived from the domain names extracted from the URL address of the net request and the URL address of the page (or frame): they have to be the same. So `www.arstechnica.com` is 1st-party to `arstechnica.com`, while `arstechnica.net` is 3rd-party to `arstechnica.com`. Domain names are extracted as per [Mozilla's Public Suffix List](https://publicsuffix.org/).
+
 ![Figure 2](https://raw.githubusercontent.com/gorhill/uBlock/master/doc/img/dynamic-filtering-2.png)
 
 Color scheme: