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diff --git a/openpower/sv/biginteger.mdwn b/openpower/sv/biginteger.mdwn
index 63645c0e7de35ee12503aa74b499966103fa4dab..18cd7b0cd7321e229d5182b1c76f61a8b7a4cf32 100644 (file)
--- a/openpower/sv/biginteger.mdwn
+++ b/openpower/sv/biginteger.mdwn
@@ -41,7 +41,8 @@ ALU.
 
 ## Multiply
 
-Multiply is tricky: 64 bit operands actually produce a 128-bit result.
+Multiply is tricky: 64 bit operands actually produce a 128-bit result,
+which clearly cannot fit into an orthogonal register file.
 Most Scalar RISC ISAs have separate `mul-low-half` and `mul-hi-half`
 instructions, whilst some (OpenRISC) have "Accumulators" from which
 the results of the multiply must be explicitly extracted. High