diff --git a/tornado/ioloop.py b/tornado/ioloop.py
index 27aaac46ea..e1e4830015 100644
--- a/tornado/ioloop.py
+++ b/tornado/ioloop.py
@@ -42,7 +42,11 @@ def poll(self, timeout):
         pass
 
 class Kqueue(Multiplex):
-    """Kqueue Multiplexer"""
+    """Kqueue Multiplexer
+    
+    Broken in Python 2.6.2
+    http://bugs.python.org/issue5910
+    """
     FLAGS = select.KQ_FILTER_READ | select.KQ_FILTER_WRITE
 
     def __init__(self):