diff --git a/src/mibew/libs/classes/Mibew/EventDispatcher/Events.php b/src/mibew/libs/classes/Mibew/EventDispatcher/Events.php
index 5745811c..954ee867 100644
--- a/src/mibew/libs/classes/Mibew/EventDispatcher/Events.php
+++ b/src/mibew/libs/classes/Mibew/EventDispatcher/Events.php
@@ -164,6 +164,19 @@ final class Events
      */
     const RESOURCE_NOT_FOUND = 'resourceNotFound';
 
+    /**
+     * Thread is updated.
+     *
+     * This event is triggered after a thread is saved and only if some of its
+     * fields have been changed. An associative array with the following items
+     * is passed to the event handlers:
+     *  - "thread": Thread object that was chanded.
+     *  - "changed_fields": list of changed fields. Names of the fields
+     *    correspond to class properties (see {@link \Mibew\Thread::propertyMap}
+     *    for details).
+     */
+    const THREAD_UPDATE = 'threadUpdate';
+
     /**
      * Threads list is ready to be sent to client.
      *
diff --git a/src/mibew/libs/classes/Mibew/Thread.php b/src/mibew/libs/classes/Mibew/Thread.php
index 998bd2a3..ec32e5ea 100644
--- a/src/mibew/libs/classes/Mibew/Thread.php
+++ b/src/mibew/libs/classes/Mibew/Thread.php
@@ -21,25 +21,12 @@ namespace Mibew;
 
 // Import namespaces and classes of the core
 use Mibew\EventDispatcher\EventDispatcher;
+use Mibew\EventDispatcher\Events;
 use Mibew\RequestProcessor\ThreadProcessor;
 
 /**
  * Represents a chat thread
  *
- * Events triggered by the class
- *  - threadChanged
- *
- * Full description of triggered events:
- *
- * 1. "threadChanged" - triggers just after thread saved and only if some thread
- * fields were changed before.
- *
- * An associative array passed to event handler has following keys:
- *  - 'thread': Thread object that was chanded.
- *  - 'changed_fields': list of changed fields. Names of the fields correspond
- *    to class properties (see Thread::propertyMap for details) NOT to fields
- *    names in database.
- *
  * @todo Think about STATE_* and KIND_* constant systems and may be simplifies
  *   them.
  */
@@ -649,6 +636,8 @@ class Thread
     /**
      * Save the thread to the database
      *
+     * Triggers {@link \Mibew\EventDispatcher\Events::THREAD_UPDATE} event.
+     *
      * @param boolean $update_revision Indicates if last modified time and last
      *   revision should be updated.
      */
@@ -686,7 +675,7 @@ class Thread
             'changed_fields' => $this->changedFields,
         );
         $dispatcher = EventDispatcher::getInstance();
-        $dispatcher->triggerEvent('threadChanged', $args);
+        $dispatcher->triggerEvent(Events::THREAD_UPDATE, $args);
 
         // Clear updated fields
         $this->changedFields = array();