diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -642,6 +642,7 @@
     'DiffusionCommitHintQuery' => 'applications/diffusion/query/DiffusionCommitHintQuery.php',
     'DiffusionCommitHookEngine' => 'applications/diffusion/engine/DiffusionCommitHookEngine.php',
     'DiffusionCommitHookRejectException' => 'applications/diffusion/exception/DiffusionCommitHookRejectException.php',
+    'DiffusionCommitListController' => 'applications/diffusion/controller/DiffusionCommitListController.php',
     'DiffusionCommitMergeHeraldField' => 'applications/diffusion/herald/DiffusionCommitMergeHeraldField.php',
     'DiffusionCommitMessageHeraldField' => 'applications/diffusion/herald/DiffusionCommitMessageHeraldField.php',
     'DiffusionCommitPackageAuditHeraldField' => 'applications/diffusion/herald/DiffusionCommitPackageAuditHeraldField.php',
@@ -1873,7 +1874,6 @@
     'PhabricatorAuditController' => 'applications/audit/controller/PhabricatorAuditController.php',
     'PhabricatorAuditEditor' => 'applications/audit/editor/PhabricatorAuditEditor.php',
     'PhabricatorAuditInlineComment' => 'applications/audit/storage/PhabricatorAuditInlineComment.php',
-    'PhabricatorAuditListController' => 'applications/audit/controller/PhabricatorAuditListController.php',
     'PhabricatorAuditListView' => 'applications/audit/view/PhabricatorAuditListView.php',
     'PhabricatorAuditMailReceiver' => 'applications/audit/mail/PhabricatorAuditMailReceiver.php',
     'PhabricatorAuditManagementDeleteWorkflow' => 'applications/audit/management/PhabricatorAuditManagementDeleteWorkflow.php',
@@ -5346,6 +5346,7 @@
     'DiffusionCommitHintQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
     'DiffusionCommitHookEngine' => 'Phobject',
     'DiffusionCommitHookRejectException' => 'Exception',
+    'DiffusionCommitListController' => 'DiffusionController',
     'DiffusionCommitMergeHeraldField' => 'DiffusionCommitHeraldField',
     'DiffusionCommitMessageHeraldField' => 'DiffusionCommitHeraldField',
     'DiffusionCommitPackageAuditHeraldField' => 'DiffusionCommitHeraldField',
@@ -6764,7 +6765,6 @@
       'Phobject',
       'PhabricatorInlineCommentInterface',
     ),
-    'PhabricatorAuditListController' => 'PhabricatorAuditController',
     'PhabricatorAuditListView' => 'AphrontView',
     'PhabricatorAuditMailReceiver' => 'PhabricatorObjectMailReceiver',
     'PhabricatorAuditManagementDeleteWorkflow' => 'PhabricatorAuditManagementWorkflow',
diff --git a/src/applications/audit/application/PhabricatorAuditApplication.php b/src/applications/audit/application/PhabricatorAuditApplication.php
--- a/src/applications/audit/application/PhabricatorAuditApplication.php
+++ b/src/applications/audit/application/PhabricatorAuditApplication.php
@@ -3,7 +3,7 @@
 final class PhabricatorAuditApplication extends PhabricatorApplication {
 
   public function getBaseURI() {
-    return '/audit/';
+    return '/diffusion/commit/';
   }
 
   public function getIcon() {
@@ -18,25 +18,16 @@
     return pht('Browse and Audit Commits');
   }
 
-  public function isPinnedByDefault(PhabricatorUser $viewer) {
-    return true;
-  }
-
-  public function getHelpDocumentationArticles(PhabricatorUser $viewer) {
-    return array(
-      array(
-        'name' => pht('Audit User Guide'),
-        'href' => PhabricatorEnv::getDoclink('Audit User Guide'),
-      ),
-    );
+  public function canUninstall() {
+    // Audit was once a separate application, but has largely merged with
+    // Diffusion.
+    return false;
   }
 
-  public function getRoutes() {
-    return array(
-      '/audit/' => array(
-        '(?:query/(?P<queryKey>[^/]+)/)?' => 'PhabricatorAuditListController',
-      ),
-    );
+  public function isPinnedByDefault(PhabricatorUser $viewer) {
+    return parent::isClassInstalledForViewer(
+      'PhabricatorDiffusionApplication',
+      $viewer);
   }
 
   public function getApplicationOrder() {
diff --git a/src/applications/audit/conduit/AuditConduitAPIMethod.php b/src/applications/audit/conduit/AuditConduitAPIMethod.php
--- a/src/applications/audit/conduit/AuditConduitAPIMethod.php
+++ b/src/applications/audit/conduit/AuditConduitAPIMethod.php
@@ -3,7 +3,8 @@
 abstract class AuditConduitAPIMethod extends ConduitAPIMethod {
 
   final public function getApplication() {
-    return PhabricatorApplication::getByClass('PhabricatorAuditApplication');
+    return PhabricatorApplication::getByClass(
+      'PhabricatorDiffusionApplication');
   }
 
 }
diff --git a/src/applications/audit/controller/PhabricatorAuditListController.php b/src/applications/audit/controller/PhabricatorAuditListController.php
deleted file mode 100644
--- a/src/applications/audit/controller/PhabricatorAuditListController.php
+++ /dev/null
@@ -1,19 +0,0 @@
-<?php
-
-final class PhabricatorAuditListController
-  extends PhabricatorAuditController {
-
-  public function shouldAllowPublic() {
-    return true;
-  }
-
-  public function handleRequest(AphrontRequest $request) {
-    $controller = id(new PhabricatorApplicationSearchController())
-      ->setQueryKey($request->getURIData('queryKey'))
-      ->setSearchEngine(new PhabricatorCommitSearchEngine())
-      ->setNavigation($this->buildSideNavView());
-
-    return $this->delegateToController($controller);
-  }
-
-}
diff --git a/src/applications/audit/editor/PhabricatorAuditEditor.php b/src/applications/audit/editor/PhabricatorAuditEditor.php
--- a/src/applications/audit/editor/PhabricatorAuditEditor.php
+++ b/src/applications/audit/editor/PhabricatorAuditEditor.php
@@ -42,7 +42,7 @@
   }
 
   public function getEditorApplicationClass() {
-    return 'PhabricatorAuditApplication';
+    return 'PhabricatorDiffusionApplication';
   }
 
   public function getEditorObjectsDescription() {
diff --git a/src/applications/audit/mail/PhabricatorAuditMailReceiver.php b/src/applications/audit/mail/PhabricatorAuditMailReceiver.php
--- a/src/applications/audit/mail/PhabricatorAuditMailReceiver.php
+++ b/src/applications/audit/mail/PhabricatorAuditMailReceiver.php
@@ -4,7 +4,7 @@
 
   public function isEnabled() {
     return PhabricatorApplication::isClassInstalled(
-      'PhabricatorAuditApplication');
+      'PhabricatorDiffusionApplication');
   }
 
   protected function getObjectPattern() {
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
@@ -73,7 +73,7 @@
   }
 
   protected function getURI($path) {
-    return '/audit/'.$path;
+    return '/diffusion/commit/'.$path;
   }
 
   protected function getBuiltinQueryNames() {
diff --git a/src/applications/diffusion/application/PhabricatorDiffusionApplication.php b/src/applications/diffusion/application/PhabricatorDiffusionApplication.php
--- a/src/applications/diffusion/application/PhabricatorDiffusionApplication.php
+++ b/src/applications/diffusion/application/PhabricatorDiffusionApplication.php
@@ -28,6 +28,10 @@
         'name' => pht('Diffusion User Guide'),
         'href' => PhabricatorEnv::getDoclink('Diffusion User Guide'),
       ),
+      array(
+        'name' => pht('Audit User Guide'),
+        'href' => PhabricatorEnv::getDoclink('Audit User Guide'),
+      ),
     );
   }
 
@@ -131,6 +135,8 @@
         'lint/' => 'DiffusionLintController',
 
         'commit/' => array(
+          $this->getQueryRoutePattern() =>
+            'DiffusionCommitListController',
           $this->getEditRoutePattern('edit/') =>
             'DiffusionCommitEditController',
         ),
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryListController.php b/src/applications/diffusion/controller/DiffusionCommitListController.php
copy from src/applications/diffusion/controller/DiffusionRepositoryListController.php
copy to src/applications/diffusion/controller/DiffusionCommitListController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryListController.php
+++ b/src/applications/diffusion/controller/DiffusionCommitListController.php
@@ -1,13 +1,14 @@
 <?php
 
-final class DiffusionRepositoryListController extends DiffusionController {
+final class DiffusionCommitListController
+  extends DiffusionController {
 
   public function shouldAllowPublic() {
     return true;
   }
 
   public function handleRequest(AphrontRequest $request) {
-    return id(new PhabricatorRepositorySearchEngine())
+    return id(new PhabricatorCommitSearchEngine())
       ->setController($this)
       ->buildResponse();
   }
@@ -15,9 +16,9 @@
   protected function buildApplicationCrumbs() {
     $crumbs = parent::buildApplicationCrumbs();
 
-    id(new DiffusionRepositoryEditEngine())
-      ->setViewer($this->getViewer())
-      ->addActionToCrumbs($crumbs);
+    $crumbs->addTextCrumb(
+      pht('Commits'),
+      $this->getApplicationURI('commit/'));
 
     return $crumbs;
   }
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryListController.php b/src/applications/diffusion/controller/DiffusionRepositoryListController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryListController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryListController.php
@@ -7,8 +7,19 @@
   }
 
   public function handleRequest(AphrontRequest $request) {
+    $items = array();
+
+    $items[] = id(new PHUIListItemView())
+      ->setType(PHUIListItemView::TYPE_LABEL)
+      ->setName(pht('Commits'));
+
+    $items[] = id(new PHUIListItemView())
+      ->setName('Browse Commits')
+      ->setHref($this->getApplicationURI('commit/'));
+
     return id(new PhabricatorRepositorySearchEngine())
       ->setController($this)
+      ->setNavigationItems($items)
       ->buildResponse();
   }
 
diff --git a/src/applications/owners/controller/PhabricatorOwnersDetailController.php b/src/applications/owners/controller/PhabricatorOwnersDetailController.php
--- a/src/applications/owners/controller/PhabricatorOwnersDetailController.php
+++ b/src/applications/owners/controller/PhabricatorOwnersDetailController.php
@@ -65,7 +65,7 @@
 
     $commit_views = array();
 
-    $commit_uri = id(new PhutilURI('/audit/'))
+    $commit_uri = id(new PhutilURI('/diffusion/commit/'))
       ->setQueryParams(
         array(
           'auditorPHIDs' => $package->getPHID(),
diff --git a/src/applications/people/engine/PhabricatorPeopleProfileMenuEngine.php b/src/applications/people/engine/PhabricatorPeopleProfileMenuEngine.php
--- a/src/applications/people/engine/PhabricatorPeopleProfileMenuEngine.php
+++ b/src/applications/people/engine/PhabricatorPeopleProfileMenuEngine.php
@@ -63,7 +63,7 @@
       $viewer);
     if ($have_diffusion) {
       $uri = urisprintf(
-        '/audit/?authors=%s#R',
+        '/diffusion/commit/?authors=%s#R',
         $object->getPHID());
 
       $items[] = $this->newItem()
diff --git a/src/applications/search/engine/PhabricatorJumpNavHandler.php b/src/applications/search/engine/PhabricatorJumpNavHandler.php
--- a/src/applications/search/engine/PhabricatorJumpNavHandler.php
+++ b/src/applications/search/engine/PhabricatorJumpNavHandler.php
@@ -6,7 +6,7 @@
     $jump = trim($jump);
 
     $patterns = array(
-      '/^a$/i' => 'uri:/audit/',
+      '/^a$/i' => 'uri:/diffusion/commit/',
       '/^f$/i' => 'uri:/feed/',
       '/^d$/i' => 'uri:/differential/',
       '/^r$/i' => 'uri:/diffusion/',
diff --git a/src/docs/book/phabricator.book b/src/docs/book/phabricator.book
--- a/src/docs/book/phabricator.book
+++ b/src/docs/book/phabricator.book
@@ -37,10 +37,6 @@
       "name": "Arcanist Integration",
       "include": "(^src/applications/arcanist/)"
     },
-    "audit": {
-      "name": "Audit",
-      "include": "(^src/applications/audit/)"
-    },
     "auth": {
       "name": "Auth",
       "include": "(^src/applications/auth/)"
diff --git a/src/docs/user/userguide/audit.diviner b/src/docs/user/userguide/audit.diviner
--- a/src/docs/user/userguide/audit.diviner
+++ b/src/docs/user/userguide/audit.diviner
@@ -23,8 +23,8 @@
   - **Audit Requests** which ask a user (or some other entity) to audit a
     commit. These can be triggered in a number of ways (see below).
 
-In the Audit tool's home screen (at `/audit/`) and on the homepage you can see
-commits and requests that require your action:
+In the Audit tool's home screen and on the homepage you can see commits and
+requests that require your action:
 
   - **Required Audits** are open audit requests that require you, a project
     you are a member of, or a package you own to audit a commit. An audit