diff --git a/ddl_ignore.txt b/ddl_ignore.txt
index 72c0c006828..ee4a6462261 100644
--- a/ddl_ignore.txt
+++ b/ddl_ignore.txt
@@ -1,3 +1,4 @@
 ! A list of known useful low-traffic sites are mistakenly detected as dead,
 ! e.g. tools, highly specialized resources.
 ! Domains must be accompanied by comments
+! NOTE: it is not supported by DeadDomainsLinter right now, but can be used during manual checks