add explanatory comment

diff --git a/riscv/insn_template_sv.cc b/riscv/insn_template_sv.cc
index 27634e14087afbb18eb3bfabb3db123818041aac..f96f117206ac225ebe2cffc936477b54453b02ea 100644 (file)
--- a/riscv/insn_template_sv.cc
+++ b/riscv/insn_template_sv.cc
@@ -50,7 +50,8 @@
    the state machine *also* copes with cases where registers are marked
    *specifically* as "redirected but still scalar", and the twin-predication
    version can also skip forward so that a scalar can be matched up with
-   a single bit-predicated vector.
+   a single bit-predicated vector (scalar source, single-bit-predicated
+   dest *or* the other way round).
 
    it's *really* comprehensive in other words, for just 200 or so lines.
  */