diff --git a/Doc/library/threading.rst b/Doc/library/threading.rst
index f50c2ac..5f1b9bf 100644
--- a/Doc/library/threading.rst
+++ b/Doc/library/threading.rst
@@ -284,7 +284,7 @@
       It must be called at most once per thread object.  It arranges for the
       object's :meth:`run` method to be invoked in a separate thread of control.
 
-      This method will raise a :exc:`RuntimeException` if called more than once
+      This method will raise a :exc:`RuntimeError` if called more than once
       on the same thread object.
 
    .. method:: run()