diff --git a/src/argparse.hpp b/src/argparse.hpp
index 054aa0e..fb0ae77 100644
--- a/src/argparse.hpp
+++ b/src/argparse.hpp
@@ -1,3 +1,32 @@
+/*
+  __ _ _ __ __ _ _ __   __ _ _ __ ___  ___
+ / _` | '__/ _` | '_ \ / _` | '__/ __|/ _ \ Argument Parser for Modern C++
+| (_| | | | (_| | |_) | (_| | |  \__ \  __/ http://github.com/p-ranav/argparse
+ \__,_|_|  \__, | .__/ \__,_|_|  |___/\___|  
+           |___/|_|
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2019 Pranav Srinivas Kumar <pranav.srinivas.kumar@gmail.com>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
 #pragma once
 #include <iostream>
 #include <string>
diff --git a/tests/test_positional_arguments.hpp b/tests/test_positional_arguments.hpp
index 239e771..e7deed8 100644
--- a/tests/test_positional_arguments.hpp
+++ b/tests/test_positional_arguments.hpp
@@ -55,10 +55,17 @@ TEST_CASE("Parse positional arguments with optional arguments in the middle", "[
 
 TEST_CASE("Square a number", "[positional_arguments]") {
   argparse::ArgumentParser program;
+  program.add_argument("--verbose", "-v")
+    .help("enable verbose logging")
+    .default_value(false)
+    .implicit_value(true);
+
   program.add_argument("square")
     .help("display a square of a given number")
     .action([](const std::string& value) { auto integer = std::stoi(value); return integer * integer; });
 
   program.parse_args({"./main", "15"});
   REQUIRE(program.get<int>("square") == 225);
+
+  program.print_help();
 }
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