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diff --git a/openpower/sv/rfc/ls008.mdwn b/openpower/sv/rfc/ls008.mdwn
index a0c1bfc8a536a5cf837adea62174db5345aca4e5..b398656ff2293aef59e35c8598c57b5bfc1a499e 100644 (file)
--- a/openpower/sv/rfc/ls008.mdwn
+++ b/openpower/sv/rfc/ls008.mdwn
@@ -287,7 +287,7 @@ particularly if SVP64 instructions are issued directly after the `mtspr` to SVST
 
 **Vector Length (vl)** <a name="vl" />
 
-The actual Vector length, the number of elements in a "Vector", vl may be set
+The actual Vector length, the number of elements in a "Vector", `SVSTATE.vl` may be set
 entirely dynamically at runtime from a number of sources. `setvl` is the primary
 instruction for setting Vector Length.
 `setvl` is conceptually similar but different from the Cray, SX Aurora, and RISC-V RVV
@@ -299,10 +299,10 @@ the range 0 <= VL <= MVL. Unlike RVV, VL is set **exactly** according to the fol
 where 0 <= MVL <= 127 and vlen may come from an immediate, `RA`, or from the `CTR` SPR,
 depending on options selected with the `setvl` instruction.
 
-Programmer's Note: understanding of Cray-style Vectors is far beyond the scope
-of the Power ISA Technical Reference.  Guidance on the Cray Vector paradigm is
+Programmer's Note: conceptual understanding of Cray-style Vectors is far beyond the scope
+of the Power ISA Technical Reference.  Guidance on the 50-year-old Cray Vector paradigm is
 best sought elsewhere: good studies include Academic Courses given on the 1970s
-Cray Supercomputers over the past 30 years.
+Cray Supercomputers over at least the past three decades.
 
 **SUBVL - Sub Vector Length**
 
@@ -317,7 +317,12 @@ representing 1 operation (1 element) thru 4 operations (4 elements) respectively
 Elements are best though of in the context of 3D, Audio and Video: two Left and Right
 Channel "elements" or four ARGB "elements", or three XYZ coordinate "elements".
 
-`subvl` is again primarily set by the `setvl` instruction.
+`subvl` is again primarily set by the `setvl` instruction. Not to be confused
+with `hphint`.
+
+Directly related to `subvl` is the `pack` and `unpack` Mode bits of `SVSTATE`.
+See `svstep` instruction for how to set Pack and Unpack Modes.
+
 
 **Horizontal Parallelism**