diff --git a/doc/examples/cryptoki-sign-demo.cxx b/doc/examples/cryptoki-sign-demo.cxx
index 4827995..393cc73 100644
--- a/doc/examples/cryptoki-sign-demo.cxx
+++ b/doc/examples/cryptoki-sign-demo.cxx
@@ -30,7 +30,10 @@ int main(int argc, char** argv) try {
   std::string slot;
   std::string cert;
   
-  mrw::args::parse(argc, argv, mrw::args::list()
+  mrw::args::parse(argc, argv,
+                   "Sign a text (optionally several times for performance"
+                   " measurements).",
+                   mrw::args::list()
                    <<mrw::args::decl("h", "help", "show help",
                                      mrw::args::decl::param_list()
                                      <<mrw::args::help()
@@ -49,7 +52,7 @@ int main(int argc, char** argv) try {
                                      <<mrw::args::param(slot, "name"))
                    <<mrw::args::decl("c","cert", "name of certificate",
                                      mrw::args::decl::param_list()
-                                     <<mrw::args::param(cert, "name")));xs
+                                     <<mrw::args::param(cert, "name")));
   
   std::cout<<"Sign text "<<r<<" times:"<<std::endl
            <<"-----------------------------------------------------"<<std::endl