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diff --git a/openpower/sv/rfc/ls010.mdwn b/openpower/sv/rfc/ls010.mdwn
index 541fffb50ef8e83b15b40bf813fa7223d6b60af5..3ed1b98762af5f5f2cd66ffff329154c37783254 100644 (file)
--- a/openpower/sv/rfc/ls010.mdwn
+++ b/openpower/sv/rfc/ls010.mdwn
@@ -1019,6 +1019,11 @@ such as crand, cror or [[sv/cr_int_predication]] crweirder may be used,
 and ffirst applied to the crop instead of to the arithmetic vector. Note
 that crops are covered by the [[sv/cr_ops]] Mode format.
 
+Use of Fail-on-first with Vertical-First Mode is not prohibited but is
+not really recommended.  The effect of truncating VL
+may have unintended and unexpected consequences on subsequent instructions.
+VLi set will be fine: it is when VLi is clear that problems may be faced.
+
 *Programmer's note: `VLi` is only accessible in normal operations which in
 turn limits the CR field bit-testing to only `EQ/NE`.  [[sv/cr_ops]] are
 not so limited.  Thus it is possible to use for example `sv.cror/ff=gt/vli