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diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index e7e853dd8e..bc1d9fe1d5 100644
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@@ -732,6 +732,8 @@ always available.
This is a dictionary that maps module names to modules which have already been
loaded. This can be manipulated to force reloading of modules and other tricks.
+ However, replacing the dictionary will not necessarily work as expected and
+ deleting essential items from the dictionary may cause Python to fail.
.. data:: path