diff --git a/Wiki/SyntaxMeaningsThatAreActuallyHumanReadable.md b/Wiki/SyntaxMeaningsThatAreActuallyHumanReadable.md
index 35ba25750..175ab14a6 100644
--- a/Wiki/SyntaxMeaningsThatAreActuallyHumanReadable.md
+++ b/Wiki/SyntaxMeaningsThatAreActuallyHumanReadable.md
@@ -91,6 +91,7 @@
 * `$all`: Officially combines all other non-party `$` values. In practice it combines the use of no `$` values at all + `$popup` + `$document`.
 * `$redirect-rule`: Similar to `$redirect`, but is only applied if it's already blocked by *another* entry or dynamic rule(set).
 * `@@||` + `$ghide`: Same as `@@||` + `$generichide`.
+* `@@` + `$cname`: Prevents another site from being strict-blocked if the domain shows up in its CNAME response. `$~cname`, and `$cname` for blocking, also exist, but are poorly documented.
 
 ### Adblock Plus, Adblock and AdGuard only:
 * `$webrtc`: Prevents such resources from being downloaded through the titular JavaScript API. The uBO equivalent seems to be `##+js(nowebrtc)`, but conversion is not done automatically.