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diff --git a/openpower/sv/svp64.mdwn b/openpower/sv/svp64.mdwn
index 9db2e1969bcda036b63e0925b7481c803b26dc42..5a47042189f18ae1ab2f891e6e8b6ba2f9c5a382 100644 (file)
--- a/openpower/sv/svp64.mdwn
+++ b/openpower/sv/svp64.mdwn
@@ -214,6 +214,10 @@ Fields:
 * **N** sets signed/unsigned saturation.
 **RC1** as if Rc=1, stores CRs *but not the result*
 
+## LD/ST ffirst
+
+ffirst LD/ST to multiple pages via a Vectorised base is considered a security risk due to the abuse of probing multiple pages in rapid succession and getting feedback on which pages would fail.  Therefore in these special circumstances requesting ffirst eith a vector base is instead interpreted as element-strided LD/ST.
+
 # ELWIDTH Encoding
 
 Default behaviour is set to 0b00 so that zeros follow the convention of