diff --git a/Dynamic-filtering:-default-deny:-useful-rulesets.md b/Dynamic-filtering:-default-deny:-useful-rulesets.md
index 9b75349..470e2f8 100644
--- a/Dynamic-filtering:-default-deny:-useful-rulesets.md
+++ b/Dynamic-filtering:-default-deny:-useful-rulesets.md
@@ -14,6 +14,14 @@ Reminder: the `noop` rule action means that network requests will not be filtere
     # Exception for enabling firefox sync
     * services.mozilla.com * noop
 
+    # Embedded Youtube videos
+    # If you block `youtube.com` by default, NO connections to the following
+    # hostnames will occur when a Youtube video is embedded in web page.
+    # As soon as you allow `youtube.com` on the page, the page will connect
+    # to these hostnames and the embedded video will work right away.
+    * ytimg.com * noop
+    * googlevideo.com * noop
+
     # Local
 
     # 9to5mac.com