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-rw-r--r--Doc/library/select.rst5
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diff --git a/Doc/library/select.rst b/Doc/library/select.rst
index 48e289a..6dbf16f 100644
--- a/Doc/library/select.rst
+++ b/Doc/library/select.rst
@@ -154,6 +154,11 @@ Edge and Level Trigger Polling (epoll) Objects
Register a fd descriptor with the epoll object.
+ .. note::
+
+ Registering a file descriptor that's already registered raises an
+ IOError -- contrary to :ref:`poll-objects`'s register.
+
.. method:: epoll.modify(fd, eventmask)