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diff --git a/shakti/m_class/I2S.mdwn b/shakti/m_class/I2S.mdwn
index 80e5dbaba181018564125ed75a549ea5916a4ec0..6d91512a7b5031ceb6d88b83cb904de8c075dc1a 100644 (file)
--- a/shakti/m_class/I2S.mdwn
+++ b/shakti/m_class/I2S.mdwn
@@ -3,6 +3,8 @@
 * <http://bugs.libre-riscv.org/show_bug.cgi?id=3>
 * <https://github.com/skristiansson/i2s>
 * <https://en.wikipedia.org/wiki/I%C2%B2S>
+* <http://www.ti.com/lit/an/snla221/snla221.pdf>
+* <https://www.sparkfun.com/datasheets/BreakoutBoards/I2SBUS.pdf>
 
 Question: how does I2S do 4-wire output?