Index: includes/install.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/install.inc,v
retrieving revision 1.89
diff -u -r1.89 install.inc
--- includes/install.inc	9 May 2009 18:35:01 -0000	1.89
+++ includes/install.inc	10 May 2009 05:29:51 -0000
@@ -610,6 +610,7 @@
     // Uninstall the module.
     module_load_install($module);
     module_invoke($module, 'uninstall');
+    watchdog('system', '%module module uninstalled.', array('%module' => $module), WATCHDOG_INFO);
 
     // Now remove the menu links for all paths declared by this module.
     if (!empty($paths)) {
Index: includes/module.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/module.inc,v
retrieving revision 1.140
diff -u -r1.140 module.inc
--- includes/module.inc	11 Apr 2009 17:58:17 -0000	1.140
+++ includes/module.inc	10 May 2009 05:29:51 -0000
@@ -258,6 +258,7 @@
         ->execute();
       drupal_load('module', $module);
       $invoke_modules[] = $module;
+      watchdog('system', '%module module enabled.', array('%module' => $module), WATCHDOG_INFO);
     }
   }
 
@@ -309,6 +310,7 @@
         ->condition('name', $module)
         ->execute();
       $invoke_modules[] = $module;
+      watchdog('system', '%module module disabled.', array('%module' => $module), WATCHDOG_INFO);
     }
   }