diff --git a/IRC-guidelines.md b/IRC-guidelines.md
index 1f5b328..a64b70c 100644
--- a/IRC-guidelines.md
+++ b/IRC-guidelines.md
@@ -48,6 +48,10 @@ or ask in #freenode for a staff member. We also have ``Fuchs`` idling in our cha
 
 Set a ban on ``*!*@gateway/web/freenode*$#nim-web``
 
+### Reduced moderation
+
+The ``+z`` channel mode allows operators to see messages sent by quietened users. See here for reference: https://freenode.net/kb/answer/channelmodes
+
 ## Useful links
 
 * https://freenode.net/using_the_network.shtml
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