diff --git a/pyatspi/constants.py b/pyatspi/constants.py
index 6ad3bc12d88e65e2dc8e5b038c0f8aa77d5f945e..e40285b70ad4e5016e696141d01e94a27567d71d 100644
--- a/pyatspi/constants.py
+++ b/pyatspi/constants.py
@@ -111,6 +111,8 @@ EVENT_TREE = {
     'object:children-changed:remove'],
   'object:state-changed' :
     ['object:state-changed:'],
+  'object:text-reading-position' :
+      ['object:text-reading-position:'],
   'mouse' :
     ['mouse:abs',
     'mouse:rel',