Index: includes/install.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/install.inc,v
retrieving revision 1.93
diff -u -r1.93 install.inc
--- includes/install.inc	8 Jun 2009 04:33:35 -0000	1.93
+++ includes/install.inc	14 Jun 2009 06:24:45 -0000
@@ -517,6 +517,9 @@
   asort($module_list);
   $module_list = array_keys($module_list);
   $modules_installed = array_filter($module_list, '_drupal_install_module');
+  foreach ($modules_installed as $module) {
+    watchdog('system', '%module module installed.', array('%module' => $module), WATCHDOG_INFO);
+  }
   if (!$disable_modules_installed_hook && !empty($modules_installed)) {
     module_invoke_all('modules_installed', $modules_installed);
   }
Index: modules/system/system.test
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.test,v
retrieving revision 1.50
diff -u -r1.50 system.test
--- modules/system/system.test	13 Jun 2009 21:08:31 -0000	1.50
+++ modules/system/system.test	14 Jun 2009 06:24:46 -0000
@@ -118,6 +118,7 @@
 
     // Check that hook_modules_installed and hook_modules_enabled hooks were invoked and check tables.
     $this->assertText(t('hook_modules_installed fired for aggregator'), t('hook_modules_installed fired.'));
+    $this->assertLogMessage('system', "%module module installed.", array('%module' => 'aggregator'), WATCHDOG_INFO);
     $this->assertText(t('hook_modules_enabled fired for aggregator'), t('hook_modules_enabled fired.'));
     $this->assertModules(array('aggregator'), TRUE);
     $this->assertTableCount('aggregator', TRUE);