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diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index 99c778f6..c7c35df9 100644
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@@ -592,3 +592,10 @@ Here you see that the SYSINIT(9) entries are no longer static. The
``*_REFERENCE()`` macros will create references to the corresponding modules
which are later resolved by the linker. The application has to provide an
object file with references to all required FreeBSD modules.
+
+System Control Hints
+====================
+
+If you get undefined references to ``_bsd_sysctl_*`` symbols, then you have to
+locate and add the associated system control node, see
+`SYSCTL(9) <http://www.freebsd.org/cgi/man.cgi?query=SYSCTL_DECL&sektion=9>`_.