diff --git a/Dynamic-filtering:-default-deny:-useful-rulesets.md b/Dynamic-filtering:-default-deny:-useful-rulesets.md
index e82d65a..40c66b0 100644
--- a/Dynamic-filtering:-default-deny:-useful-rulesets.md
+++ b/Dynamic-filtering:-default-deny:-useful-rulesets.md
@@ -1,3 +1,5 @@
+Reminder: the `noop` rule action means that network requests will not be filtered through dynamic filtering, but they will still be filtered through static filtering (_EasyList_, _EasyPrivacy_, etc). 
+
 ##### economist.com
 
     www.economist.com static-economist.com * noop
@@ -31,6 +33,10 @@
     twitch.tv swiftype.com * noop
     twitch.tv ttvnw.net * noop
 
+##### twitter.com
+
+    twitter.com twimg.com * noop
+
 ##### youtube.com
 
     youtube.com content.googleapis.com * noop