Add synth_xilinx -widemux recommended value

diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc
index 62bfaaaf12265e0bbf37a4f3b063f8168128cf6f..7836f9f3ef62cf694f65071f9ea68061e2035a0f 100644 (file)
--- a/techlibs/xilinx/synth_xilinx.cc
+++ b/techlibs/xilinx/synth_xilinx.cc
@@ -79,7 +79,7 @@ struct SynthXilinxPass : public ScriptPass
                log("\n");
                log("    -widemux <int>\n");
                log("        enable inference of hard multiplexer resources (MuxFx) for muxes at or\n");
-               log("        above this number of inputs (minimum value 2).\n");
+               log("        above this number of inputs (minimum value 2, recommended value >= 5).\n");
                log("        default: 0 (no inference)\n");
                log("\n");
                log("    -run <from_label>:<to_label>\n");