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diff --git a/openpower/sv/svp_rewrite/svp64.mdwn b/openpower/sv/svp_rewrite/svp64.mdwn
index f6d1bf16636fa9e4af71bc9f3090fcc1e85d89da..746e1a4bf148350c6df7018170bb10f153633d1a 100644 (file)
--- a/openpower/sv/svp_rewrite/svp64.mdwn
+++ b/openpower/sv/svp_rewrite/svp64.mdwn
@@ -18,7 +18,9 @@ suffix. The prefix always comes before the suffix in PC order.
 
 SVP64 is designed so that when the prefix is all zeros, no effect or
 influence occurs (no augmentation) such that all standard OpenPOWER
-v3.0/1B instructions are "unaltered". This is termed `scalar identity behaviour` (based on the mathematical definition for "identity", as in, "identity matrix" or better "identity transformation")
+v3.0/1B instructions are "unaltered". This is termed `scalar identity behaviour` (based on the mathematical definition for "identity", as in, "identity matrix" or better "identity transformation").
+
+Note that this is completely different from when VL=0.  VL=0 turns all operations under its influence into `nops`, whereas when VL=1 and the SV prefix is all zeros, the operation simply acts as if SV had not been applied at all (an "identity operation").
 
 # Definition of Reserved in this spec.