diff --git a/pmg-mail-filter.adoc b/pmg-mail-filter.adoc
index 79eec37..91e9a00 100644
--- a/pmg-mail-filter.adoc
+++ b/pmg-mail-filter.adoc
@@ -233,6 +233,11 @@ Archive Filter::
 Can be used to match specific content types inside archives.
 This also matches the content-types of all regular (non-archived) attachments.
 
+Match Archive Filename::
+
+Uses regular expressions to match attachment filenames inside archives.
+This also matches the filenames for all regular (non-archived) attachments.
+
 
 [[pmg_mailfilter_when]]
 'When' - objects