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diff --git a/docs/TableGenFundamentals.rst b/docs/TableGenFundamentals.rst
index 526795f53d..4fe4bb986a 100644
--- a/docs/TableGenFundamentals.rst
+++ b/docs/TableGenFundamentals.rst
@@ -791,6 +791,10 @@ Expressions used by code generator to describe instructions and isel patterns:
TableGen backends
=================
+Until we get a step-by-step HowTo for writing TableGen backends, you can at
+least grab the boilerplate (build system, new files, etc.) from Clang's
+r173931.
+
TODO: How they work, how to write one. This section should not contain details
about any particular backend, except maybe ``-print-enums`` as an example. This
should highlight the APIs in ``TableGen/Record.h``.