diff --git a/Doc/library/sched.rst b/Doc/library/sched.rst
index f93c9b5..0290ec4 100644
--- a/Doc/library/sched.rst
+++ b/Doc/library/sched.rst
@@ -100,7 +100,7 @@
 .. method:: scheduler.cancel(event)
 
    Remove the event from the queue. If *event* is not an event currently in the
-   queue, this method will raise a :exc:`RuntimeError`.
+   queue, this method will raise a :exc:`ValueError`.
 
 
 .. method:: scheduler.empty()
diff --git a/Lib/sched.py b/Lib/sched.py
index 11bb0a3..f6a699c 100644
--- a/Lib/sched.py
+++ b/Lib/sched.py
@@ -73,7 +73,7 @@
         """Remove an event from the queue.
 
         This must be presented the ID as returned by enter().
-        If the event is not in the queue, this raises RuntimeError.
+        If the event is not in the queue, this raises ValueError.
 
         """
         self._queue.remove(event)