diff --git a/argument.hpp b/argument.hpp
index 9c91615..81876da 100644
--- a/argument.hpp
+++ b/argument.hpp
@@ -1,6 +1,7 @@
 #ifndef __ARGUMENT_H
 #define __ARGUMENT_H
 #include <getopt.h>
+
 #include <map>
 #include <string>
 
@@ -13,43 +14,43 @@
  */
 class ArgumentParser
 {
-    public:
-        ArgumentParser() = delete;
-        ~ArgumentParser() = default;
-        ArgumentParser(const ArgumentParser&) = delete;
-        ArgumentParser& operator=(const ArgumentParser&) = delete;
-        ArgumentParser(ArgumentParser&&) = default;
-        ArgumentParser& operator=(ArgumentParser&&) = default;
+  public:
+    ArgumentParser() = delete;
+    ~ArgumentParser() = default;
+    ArgumentParser(const ArgumentParser&) = delete;
+    ArgumentParser& operator=(const ArgumentParser&) = delete;
+    ArgumentParser(ArgumentParser&&) = default;
+    ArgumentParser& operator=(ArgumentParser&&) = default;
 
-        /** @brief Constructs Argument object
-         *
-         *  @param argc - the main function's argc passed as is
-         *  @param argv - the main function's argv passed as is
-         *  @return Object constructed
-         */
-        ArgumentParser(int argc, char** argv);
+    /** @brief Constructs Argument object
+     *
+     *  @param argc - the main function's argc passed as is
+     *  @param argv - the main function's argv passed as is
+     *  @return Object constructed
+     */
+    ArgumentParser(int argc, char** argv);
 
-        /** @brief Given a option, returns its argument(optarg) */
-        const std::string& operator[](const std::string& opt);
+    /** @brief Given a option, returns its argument(optarg) */
+    const std::string& operator[](const std::string& opt);
 
-        /** @brief Displays usage */
-        static void usage(char** argv);
+    /** @brief Displays usage */
+    static void usage(char** argv);
 
-        /** @brief Set to 'true' when an option is passed */
-        static const std::string true_string;
+    /** @brief Set to 'true' when an option is passed */
+    static const std::string true_string;
 
-        /** @brief Set to '' when an option is not passed */
-        static const std::string empty_string;
+    /** @brief Set to '' when an option is not passed */
+    static const std::string empty_string;
 
-    private:
-        /** @brief Option to argument mapping */
-        std::map<const std::string, std::string> arguments;
+  private:
+    /** @brief Option to argument mapping */
+    std::map<const std::string, std::string> arguments;
 
-        /** @brief Array of struct options as needed by getopt_long */
-        static const option options[];
+    /** @brief Array of struct options as needed by getopt_long */
+    static const option options[];
 
-        /** @brief optstring as needed by getopt_long */
-        static const char* optionstr;
+    /** @brief optstring as needed by getopt_long */
+    static const char* optionstr;
 };
 
 } // namespace led