Clarify which instructions have RM field but don't use it

Closes #279

1 files changed, 3 insertions, 3 deletions

diff --git a/src/f.tex b/src/f.tex
index 0f54cc0..c1854f0 100644
--- a/src/f.tex
+++ b/src/f.tex
@@ -158,9 +158,9 @@ encoded as shown in Table~\ref{rm}.  A value of 111 in the instruction's {\em
 rm} field selects the dynamic rounding mode held in {\tt frm}.  If {\tt frm}
 is set to an invalid value (101--111), any subsequent attempt to execute
 a floating-point operation with a dynamic rounding mode will raise an illegal
-instruction exception.  Some instructions that have the {\em rm} field are
-nevertheless unaffected by the rounding mode; they should have their {\em rm}
-field set to RNE (000).
+instruction exception.  Some instructions, including widening conversions,
+have the {\em rm} field but are nevertheless unaffected by the rounding mode;
+software should set their {\em rm} field to RNE (000).
 
 \begin{commentary}
 The C99 language standard effectively mandates the provision of a