diff --git a/Static-filter-syntax.md b/Static-filter-syntax.md
index 85b5d8d..19433ca 100644
--- a/Static-filter-syntax.md
+++ b/Static-filter-syntax.md
@@ -919,6 +919,8 @@ Can only be used in a trusted-source origin.
 
 Transform the path/query/hash portion of a URL.
 
+See <https://adguard.com/kb/general/ad-filtering/create-own-filters/#urltransform-modifier>
+
 [Documentation to be completed]
 
 ***