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diff --git a/shakti/m_class.mdwn b/shakti/m_class.mdwn
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--- a/shakti/m_class.mdwn
+++ b/shakti/m_class.mdwn
@@ -190,6 +190,7 @@ TBD
 
 # Proposed Interfaces
 
+* Plain [[GPIO]] multiplexed with a [[pinmux]] onto (nearly) all other pins
 * RGB/TTL up to 1440x900 @ 60fps, 24-bit colour
 * 2x 1-lane SPI
 * 1x 4-lane (quad) SPI