Issue #16853: Mention the new selectors module in the select module
diff --git a/Doc/library/select.rst b/Doc/library/select.rst
index 02ce775..524e411 100644
--- a/Doc/library/select.rst
+++ b/Doc/library/select.rst
@@ -14,6 +14,14 @@
It cannot be used on regular files to determine whether a file has grown since
it was last read.
+.. note::
+
+ The :mod:`selectors` module allows high-level and efficient I/O
+ multiplexing, built upon the :mod:`select` module primitives. Users are
+ encouraged to use the :mod:`selectors` module instead, unless they want
+ precise control over the OS-level primitives used.
+
+
The module defines the following: