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@@ -627,6 +627,12 @@ functions.
  the value in ``pw_uid`` will be used. If the value is an integer, it will
  be passed verbatim. (POSIX only)
 
+ .. note::
+
+ Specifying *user* will not drop existing supplementary group memberships!
+ The caller must also pass ``extra_groups=()`` to reduce the group membership
+ of the child process for security purposes.
+
  .. availability:: POSIX
  .. versionadded:: 3.9