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diff --git a/openpower/sv/byteswap.mdwn b/openpower/sv/byteswap.mdwn
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--- a/openpower/sv/byteswap.mdwn
+++ b/openpower/sv/byteswap.mdwn
@@ -2,7 +2,7 @@
 
 ## Byte-swapping Mux
 
-gate count for 4:1 MUX is estimated at 8 gates.  8x 64 gates for a total of 512 gates to provide aligned byteswapping 64 bit.
+gate count for 4:1 MUX is estimated at 8 gates.  8x 64 gates for a total of 512 gates to provide aligned byteswapping 64 bit. (actually likely 5x64 for MUX pary and 2x8 for selection part)
 
 <img alt="Byte-swap mux diagram" src="../byteswap_mux.svg" width="100%"/>