diff --git a/doc/source/overview.rst b/doc/source/overview.rst
index 51e97d4d..96e1a48f 100644
--- a/doc/source/overview.rst
+++ b/doc/source/overview.rst
@@ -272,8 +272,8 @@ by OpenDKIM screen policy script before validating the signatures. This
 corresponds to strict :rfc:`DMARC <7489>` alignment (``adkim=s``).
 If there is no valid DKIM signature on the incoming email, the
 sender receives a “5.7.1 No valid DKIM signature found” error.
-After validating the DKIM signature, OpenDKIM strips all ``OpenDKIM:`` headers to
-reduce message size.
+After validating the DKIM signature, 
+the `final.lua` script strips all ``OpenDKIM:`` headers to reduce message size on disc. 
 
 Note that chatmail relays