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-rw-r--r--Doc/tutorial/modules.rst7
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diff --git a/Doc/tutorial/modules.rst b/Doc/tutorial/modules.rst
index eee989f..4d06df2 100644
--- a/Doc/tutorial/modules.rst
+++ b/Doc/tutorial/modules.rst
@@ -106,6 +106,13 @@ In most cases Python programmers do not use this facility since it introduces
an unknown set of names into the interpreter, possibly hiding some things
you have already defined.
+.. note::
+
+ For efficiency reasons, each module is only imported once per interpreter
+ session. Therefore, if you change your modules, you must restart the
+ interpreter -- or, if it's just one module you want to test interactively,
+ use :func:`reload`, e.g. ``reload('modulename')``.
+
.. _tut-modulesasscripts: