diff --git a/main.cpp b/main.cpp
index 9778dca..0fd0cab 100644
--- a/main.cpp
+++ b/main.cpp
@@ -8,8 +8,11 @@ namespace po = boost::program_options;
 
 int main(int argc, char *argv[])
 {
+    std::string letters;
+
     po::options_description desc("Erlaubte Optionen");
-    desc.add_options()("help,h", "Ausgabe der Hilfe");
+    desc.add_options()("help,h", "Ausgabe der Hilfe")("letters,l", po::value<std::string>(&letters),
+                                                      "Enthaltene Buchstaben");
 
     po::variables_map vm;
     po::store(po::parse_command_line(argc, argv, desc), vm);