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diff --git a/openpower/sv.mdwn b/openpower/sv.mdwn
index 13e7812fbfeab8010aad5886d764bea56c5e2215..23eca52835674b6c12f6d8255b6b762c4dac6476 100644 (file)
--- a/openpower/sv.mdwn
+++ b/openpower/sv.mdwn
@@ -70,6 +70,13 @@ same level as add, popcnt and fld**
   for a location at all, and may be moved to EXT059, EXT019,
   EXT031 or other much more suitable location.
 
+Note that there is no Sandbox allocation in the published ISA Spec for
+v3.1 EXT01 usage, and because SVP64 is already 64-bit Prefixed,
+Prefixed-Prefixed-instructions (SVP64 Prefixed v3.1 Prefixed)
+would become a whopping 96-bit long instruction. Avoiding this
+situation is a high priority which in turn by necessity puts pressure
+on the 32-bit Major Opcode space.
+
 # Sub-pages
 
 Pages being developed and examples