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diff --git a/shakti/m_class/I2S.mdwn b/shakti/m_class/I2S.mdwn
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 * <http://bugs.libre-riscv.org/show_bug.cgi?id=3>
 * <https://github.com/skristiansson/i2s>
+* <https://en.wikipedia.org/wiki/I%C2%B2S>
 
 Question: how does I2S do 4-wire output?
 
 # AC97
 
 * <https://opencores.org/project,ac97>
+* <https://en.wikipedia.org/wiki/AC%2797>
 
 Question: how does AC97 fit in with I2S?
+
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