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diff --git a/docs/pinmux.mdwn b/docs/pinmux.mdwn
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@@ -221,7 +221,9 @@ and triaging of faults.
 ## C4M JTAG TAP
 
 Staf Verhaegen's Chips4Makers JTAG TAP module includes everything
-needed to create JTAG Boundary Scan Shift Registers.  However,
+needed to create JTAG Boundary Scan Shift Registers,
+as well as the IEEE 1149.1 Finite State Machine to access
+them through TMS, TDO, TDI and TCK Signalling.  However,
 connecting up cores (a hardware term: the equivalent software
 term is "peripherals") on one side and the pads on the other is
 especially confusing, but deceptively simple.  The actual addition