diff --git a/site/profiles/manifests/postfix/gateway.pp b/site/profiles/manifests/postfix/gateway.pp
index d3d0478..1254184 100644
--- a/site/profiles/manifests/postfix/gateway.pp
+++ b/site/profiles/manifests/postfix/gateway.pp
@@ -86,7 +86,7 @@ class profiles::postfix::gateway (
       'postscreen_dnsbl_threshold' => {
         'value' => '2'
       },
-      # el9 ships postfix 3.5, before the allowlist rename
+      # dnswl-listed clients (net score <= -1) skip the slow greet tests; el9 postfix 3.5 predates the allowlist rename
       'postscreen_dnsbl_whitelist_threshold' => {
         'value' => '-1'
       },