diff --git a/src/applications/differential/parser/changeset/DifferentialChangesetParser.php b/src/applications/differential/parser/changeset/DifferentialChangesetParser.php
index e3c605dc9c..4682350451 100644
--- a/src/applications/differential/parser/changeset/DifferentialChangesetParser.php
+++ b/src/applications/differential/parser/changeset/DifferentialChangesetParser.php
@@ -540,7 +540,18 @@ class DifferentialChangesetParser {
       ipull($this->intra, 1),
       $new_corpus);
 
-    $generated = (strpos($new_corpus_block, '@'.'generated') !== false);
+    $generated_guess = (strpos($new_corpus_block, '@'.'generated') !== false);
+
+    $event = new PhabricatorEvent(
+      PhabricatorEventType::TYPE_DIFFERENTIAL_WILLMARKGENERATED,
+      array(
+        'corpus' => $new_corpus_block,
+        'is_generated' => $generated_guess
+      )
+    );
+    PhutilEventEngine::dispatchEvent($event);
+
+    $generated = $event->getValue('is_generated');
 
     $this->specialAttributes[self::ATTR_GENERATED] = $generated;
   }
diff --git a/src/applications/differential/parser/changeset/__init__.php b/src/applications/differential/parser/changeset/__init__.php
index eb424211e9..26ebee053e 100644
--- a/src/applications/differential/parser/changeset/__init__.php
+++ b/src/applications/differential/parser/changeset/__init__.php
@@ -15,10 +15,13 @@ phutil_require_module('phabricator', 'applications/differential/view/inlinecomme
 phutil_require_module('phabricator', 'applications/files/uri');
 phutil_require_module('phabricator', 'applications/markup/syntax');
 phutil_require_module('phabricator', 'infrastructure/diff/engine');
+phutil_require_module('phabricator', 'infrastructure/events/constant/type');
+phutil_require_module('phabricator', 'infrastructure/events/event');
 phutil_require_module('phabricator', 'infrastructure/javelin/markup');
 phutil_require_module('phabricator', 'storage/queryfx');
 
 phutil_require_module('phutil', 'error');
+phutil_require_module('phutil', 'events/engine');
 phutil_require_module('phutil', 'future');
 phutil_require_module('phutil', 'markup');
 phutil_require_module('phutil', 'utils');
diff --git a/src/docs/userguide/events.diviner b/src/docs/userguide/events.diviner
index c9894c8a29..339c5f492e 100644
--- a/src/docs/userguide/events.diviner
+++ b/src/docs/userguide/events.diviner
@@ -28,7 +28,16 @@ or alter the edit. Data available on this event:
 
 == PhabricatorEventType::TYPE_DIFFERENTIAL_WILLSENDMAIL ==
 
-This event is dispatche before Differential sends an email, and allows you to
+This event is dispatched before Differential sends an email, and allows you to
 edit the message that will be sent.  Data available on this event:
 
   - ##mail## The {@class:PhabricatorMetaMTAMail} being edited.
+
+== PhabricatorEventType::TYPE_DIFFERENTIAL_WILLMARKGENERATED ==
+
+This event is dispatched before Differential decides if a file is generated (and
+doesn't need to be reviewed) or not.  Data available on this event:
+
+  - ##corpus## Body of the file.
+  - ##is_generated## Boolean indicating if this file should be treated as
+    generated.
diff --git a/src/infrastructure/events/constant/type/PhabricatorEventType.php b/src/infrastructure/events/constant/type/PhabricatorEventType.php
index deaec635f6..9d13a84ea2 100644
--- a/src/infrastructure/events/constant/type/PhabricatorEventType.php
+++ b/src/infrastructure/events/constant/type/PhabricatorEventType.php
@@ -20,5 +20,6 @@ final class PhabricatorEventType extends PhutilEventType {
 
   const TYPE_MANIPHEST_WILLEDITTASK = 'maniphest.willEditTask';
   const TYPE_DIFFERENTIAL_WILLSENDMAIL = 'differential.willSendMail';
+  const TYPE_DIFFERENTIAL_WILLMARKGENERATED = 'differential.willMarkGenerated';
 
 }