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diff --git a/Doc/library/os.rst b/Doc/library/os.rst
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@@ -1646,6 +1646,10 @@ written in Python, such as a mail server's external command delivery program.
Fork a child process. Return ``0`` in the child and the child's process id in the
parent. If an error occurs :exc:`OSError` is raised.
+
+ Note that some platforms including FreeBSD <= 6.3, Cygwin and OS/2 EMX have
+ known issues when using fork() from a thread.
+
Availability: Unix.