Missing doc for -tech xilinx in shregmap

diff --git a/passes/techmap/shregmap.cc b/passes/techmap/shregmap.cc
index 75eedfbcc2204b2b73460064c9535ade187c8d28..21dfe96198c43a252575bb6483c2fd062b241328 100644 (file)
--- a/passes/techmap/shregmap.cc
+++ b/passes/techmap/shregmap.cc
@@ -606,6 +606,9 @@ struct ShregmapPass : public Pass {
                log("    -tech greenpak4\n");
                log("        map to greenpak4 shift registers.\n");
                log("\n");
+               log("    -tech xilinx\n");
+               log("        map to xilinx dynamic-length shift registers.\n");
+               log("\n");
        }
        void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
        {