diff --git a/src/applications/audit/query/PhabricatorCommitSearchEngine.php b/src/applications/audit/query/PhabricatorCommitSearchEngine.php
--- a/src/applications/audit/query/PhabricatorCommitSearchEngine.php
+++ b/src/applications/audit/query/PhabricatorCommitSearchEngine.php
@@ -58,6 +58,10 @@
       $query->withAncestorsOf($map['ancestorsOf']);
     }
 
+    if ($map['identifiers']) {
+      $query->withIdentifiers($map['identifiers']);
+    }
+
     return $query;
   }
 
@@ -130,6 +134,15 @@
           pht(
             'Find commits which are ancestors of a particular ref, '.
             'like "master".')),
+      id(new PhabricatorSearchStringListField())
+        ->setLabel(pht('Identifiers'))
+        ->setKey('identifiers')
+        ->setDescription(
+          pht(
+            'Find commits with particular identifiers (usually, hashes). '.
+            'Supports full or partial identifiers (like "abcd12340987..." or '.
+            '"abcd1234") and qualified or unqualified identifiers (like '.
+            '"rXabcd1234" or "abcd1234").')),
     );
   }