diff --git a/pmg-mail-filter.adoc b/pmg-mail-filter.adoc
index 8f1f2ef..79eec37 100644
--- a/pmg-mail-filter.adoc
+++ b/pmg-mail-filter.adoc
@@ -231,6 +231,7 @@ Uses regular expressions to match attachment filenames.
 Archive Filter::
 
 Can be used to match specific content types inside archives.
+This also matches the content-types of all regular (non-archived) attachments.
 
 
 [[pmg_mailfilter_when]]