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-rw-r--r--doc/about.rst2
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@@ -42,7 +42,7 @@ At the same time, like a design written in another `HDL`, a set of VHDL sources
:dfn:`synthesis tool` into a netlist, that is, a detailed gate-level implementation.
The development of VHDL started in 1983 and the standard is named `IEEE <https://www.ieee.org/>`__ `1076`.
-Six revisions exist:
+Five revisions exist:
`1987 <http://ieeexplore.ieee.org/document/26487/>`__,
`1993 <http://ieeexplore.ieee.org/document/392561/>`__,
`2002 <http://ieeexplore.ieee.org/document/1003477/>`__,