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diff --git a/docs/source/prolog.rst b/docs/source/prolog.rst
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@@ -3,5 +3,6 @@
.. recommended by the Sphinx people, who have other ways of doing it.
.. Common substitutions
-.. |vcc| replace:: V\ :sub:`cc`
+.. |vcc| replace:: V\ :sub:`CC`
+.. |vdda| replace:: V\ :sub:`DDA`
.. |i2c| replace:: I\ :sup:`2`\ C