diff --git a/Modules/clinic/selectmodule.c.h b/Modules/clinic/selectmodule.c.h
index d7095dfb00ead9..be752e981667ce 100644
--- a/Modules/clinic/selectmodule.c.h
+++ b/Modules/clinic/selectmodule.c.h
@@ -193,6 +193,10 @@ PyDoc_STRVAR(select_poll_poll__doc__,
 "\n"
 "Polls the set of registered file descriptors.\n"
 "\n"
+"  timeout\n"
+"    The maximum time to wait in milliseconds, or else None (or a negative\n"
+"    value) to wait indefinitely.\n"
+"\n"
 "Returns a list containing any descriptors that have events or errors to\n"
 "report, as a list of (fd, event) 2-tuples.");
 
@@ -363,6 +367,10 @@ PyDoc_STRVAR(select_devpoll_poll__doc__,
 "\n"
 "Polls the set of registered file descriptors.\n"
 "\n"
+"  timeout\n"
+"    The maximum time to wait in milliseconds, or else None (or a negative\n"
+"    value) to wait indefinitely.\n"
+"\n"
 "Returns a list containing any descriptors that have events or errors to\n"
 "report, as a list of (fd, event) 2-tuples.");
 
@@ -1179,4 +1187,4 @@ select_kqueue_control(kqueue_queue_Object *self, PyObject *const *args, Py_ssize
 #ifndef SELECT_KQUEUE_CONTROL_METHODDEF
     #define SELECT_KQUEUE_CONTROL_METHODDEF
 #endif /* !defined(SELECT_KQUEUE_CONTROL_METHODDEF) */
-/*[clinic end generated code: output=cd2062a787e13b35 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=a8fc031269d28454 input=a9049054013a1b77]*/
diff --git a/Modules/selectmodule.c b/Modules/selectmodule.c
index 3ecd0c32b30389..3afcb0e2a02206 100644
--- a/Modules/selectmodule.c
+++ b/Modules/selectmodule.c
@@ -564,6 +564,8 @@ select_poll_unregister_impl(pollObject *self, int fd)
 select.poll.poll
 
     timeout as timeout_obj: object = None
+      The maximum time to wait in milliseconds, or else None (or a negative
+      value) to wait indefinitely.
     /
 
 Polls the set of registered file descriptors.
@@ -574,7 +576,7 @@ report, as a list of (fd, event) 2-tuples.
 
 static PyObject *
 select_poll_poll_impl(pollObject *self, PyObject *timeout_obj)
-/*[clinic end generated code: output=876e837d193ed7e4 input=7a446ed45189e894]*/
+/*[clinic end generated code: output=876e837d193ed7e4 input=c2f6953ec45e5622]*/
 {
     PyObject *result_list = NULL;
     int poll_result, i, j;
@@ -888,6 +890,8 @@ select_devpoll_unregister_impl(devpollObject *self, int fd)
 /*[clinic input]
 select.devpoll.poll
     timeout as timeout_obj: object = None
+      The maximum time to wait in milliseconds, or else None (or a negative
+      value) to wait indefinitely.
     /
 
 Polls the set of registered file descriptors.
@@ -898,7 +902,7 @@ report, as a list of (fd, event) 2-tuples.
 
 static PyObject *
 select_devpoll_poll_impl(devpollObject *self, PyObject *timeout_obj)
-/*[clinic end generated code: output=2654e5457cca0b3c input=fd0db698d84f0333]*/
+/*[clinic end generated code: output=2654e5457cca0b3c input=3c3f0a355ec2bedb]*/
 {
     struct dvpoll dvp;
     PyObject *result_list = NULL;