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diff --git a/openpower/sv/svp64/appendix.mdwn b/openpower/sv/svp64/appendix.mdwn
index 4d7b7b46a4aac043e1a7db7e6c3ba316769d5eb8..8fb2a629c000d41138afb8fa547a5f73ea0b39a2 100644 (file)
--- a/openpower/sv/svp64/appendix.mdwn
+++ b/openpower/sv/svp64/appendix.mdwn
@@ -1076,6 +1076,11 @@ RT0 to RT2 are stored:
      r4  RT1.hi    RT2.hi
      r5  unchanged unchanged
 
+Note that all of the LO halves start from r1, but that the HI halves
+start from half-way into r3. The reason is that with MAXVL bring
+5 and elwidth being 32, this is the 5th element
+offset (in 32 bit quantities) counting from r1.
+
 Additional DRAFT Scalar instructions in 3-in 2-out form
 with an implicit 2nd destination: