diff --git a/tests/events/hook_civicrm_alterMailParams.evch.php b/tests/events/hook_civicrm_alterMailParams.evch.php
index f62f188d2751..716e9f9a3aa0 100644
--- a/tests/events/hook_civicrm_alterMailParams.evch.php
+++ b/tests/events/hook_civicrm_alterMailParams.evch.php
@@ -3,7 +3,7 @@
 
   private $paramSpecs = [
 
-    // Envelope: Common
+    // ## Envelope: Common
 
     'toName' => ['type' => 'string|NULL'],
     'toEmail' => ['type' => 'string|NULL'],
@@ -11,35 +11,36 @@
     'bcc' => ['type' => 'string|NULL'],
     'headers' => ['type' => 'array'],
     'attachments' => ['type' => 'array|NULL'],
-    'PDFFilename' => ['for' => 'messageTemplate', 'type' => 'string|NULL'],
     'isTest' => ['type' => 'bool|int'],
 
-    // Envelope: singleEmail/messageTemplate
+    // ## Envelope: singleEmail/messageTemplate
 
     'from' => ['type' => 'string|NULL', 'for' => ['messageTemplate', 'singleEmail']],
     'replyTo' => ['type' => 'string|NULL', 'for' => ['messageTemplate', 'singleEmail']],
     'returnPath' => ['type' => 'string|NULL', 'for' => ['messageTemplate', 'singleEmail']],
     'isEmailPdf' => ['type' => 'bool', 'for' => 'messageTemplate'],
+    'PDFFilename' => ['type' => 'string|NULL', 'for' => 'messageTemplate'],
     'autoSubmitted' => ['type' => 'bool', 'for' => 'messageTemplate'],
     'Message-ID' => ['type' => 'string', 'for' => ['messageTemplate', 'singleEmail']],
     'messageId' => ['type' => 'string', 'for' => ['messageTemplate', 'singleEmail']],
 
-    // Envelope: CiviMail
+    // ## Envelope: CiviMail
 
-    'Reply-To' => ['for' => ['civimail'], 'type' => 'string|NULL'],
-    'Return-Path' => ['for' => ['civimail'], 'type' => 'string|NULL'],
-    'From' => ['for' => ['civimail'], 'type' => 'string|NULL'],
-    'Subject' => ['for' => ['civimail'], 'type' => 'string|NULL'],
-    'List-Unsubscribe' => ['for' => ['civimail'], 'type' => 'string|NULL'],
-    'job_id' => ['for' => ['civimail'], 'type' => 'int|NULL'],
+    'Reply-To' => ['type' => 'string|NULL', 'for' => ['civimail']],
+    'Return-Path' => ['type' => 'string|NULL', 'for' => ['civimail']],
+    'From' => ['type' => 'string|NULL', 'for' => ['civimail']],
+    'Subject' => ['type' => 'string|NULL', 'for' => ['civimail']],
+    'List-Unsubscribe' => ['type' => 'string|NULL', 'for' => ['civimail']],
+    'job_id' => ['type' => 'int|NULL', 'for' => ['civimail']],
 
-    // Content
+    // ## Content
 
     'subject' => ['for' => ['messageTemplate', 'singleEmail'], 'type' => 'string'],
     'text' => ['type' => 'string|NULL'],
     'html' => ['type' => 'string|NULL'],
 
-    // Model: messageTemplate
+    // ## Model: messageTemplate
+
     'tokenContext' => ['type' => 'array', 'for' => 'messageTemplate'],
     'tplParams' => ['type' => 'array', 'for' => 'messageTemplate'],
     'contactId' => ['type' => 'int|NULL', 'for' => 'messageTemplate' /* deprecated in favor of tokenContext[contactId] */],
@@ -61,7 +62,8 @@
     'model' => ['for' => 'messageTemplate', 'type' => 'NULL'],
     'modelProps' => ['for' => 'messageTemplate', 'type' => 'NULL'],
 
-    // Model: Adhoc/incomplete/needs attention
+    // ## Model: Adhoc/incomplete/needs attention
+
     'contributionId' => ['type' => 'int', 'for' => 'messageTemplate'],
     'petitionId' => ['type' => 'int', 'for' => 'messageTemplate'],
     'petitionTitle' => ['type' => 'string', 'for' => 'messageTemplate'],
@@ -69,7 +71,8 @@
     'entity' => ['type' => 'string|NULL', 'for' => 'singleEmail'],
     'entity_id' => ['type' => 'int|NULL', 'for' => 'singleEmail'],
 
-    // View: messageTemplate
+    // ## View: messageTemplate
+
     'messageTemplateID' => ['type' => 'int|NULL', 'for' => 'messageTemplate'],
     'messageTemplate' => ['type' => 'array|NULL', 'for' => 'messageTemplate'],
     'disableSmarty' => ['type' => 'bool|int', 'for' => 'messageTemplate'],