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@@ -1884,7 +1884,10 @@ directive, i.e.
<h2>Opcodes</h2>
-The 6502 assembler uses the standard Motorola opcodes.
+The 6502 assembler uses the standard Motorola opcodes. Undocumented opcodes are
+supported and use the opcodes as described at
+<a href="https://www.masswerk.at/nowgobang/2021/6502-illegal-opcodes">
+www.masswerk.at/nowgobang/2021/6502-illegal-opcodes</a>.
<h2>Options</h2>