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diff --git a/openpower/sv/twin_butterfly.mdwn b/openpower/sv/twin_butterfly.mdwn
index f6d3882eb296a07e1c798355308868fc870201a2..69fde8b5d97af6023ae21f3b193472f615ee30ce 100644 (file)
--- a/openpower/sv/twin_butterfly.mdwn
+++ b/openpower/sv/twin_butterfly.mdwn
@@ -11,6 +11,13 @@
 
 # Rationale for Twin Butterfly Integer DCT Instruction(s)
 
+The number of general-purpose uses for DCT is huge. The
+number of instructions needed instead of these Twin-Butterfly
+instructions is also huge (**eight**) and given that it is
+extremely common to explicitly loop-unroll them quantity
+hundreds to thousands of instructions are dismayingly common
+(for all ISAs).
+
 The goal is to implement instructions that calculate the expression:
 
 ```