diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0a507f0..847a1d4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,30 +1,24 @@
 cmake_minimum_required(VERSION 3.7)
-project(iprefresher VERSION 1.0.1 DESCRIPTION "mylib description")
+project(iprefresher VERSION 1.0.1 DESCRIPTION "Dynu ip refresher")
 
 set(CMAKE_CXX_STANDARD 17)
 
 find_package(CURL REQUIRED)
-include_directories(${CURL_INCLUDE_DIR})
+include_directories(${CURL_INCLUDE_DIR} inc)
 
 add_library(api
-        src/api/API.h
         src/api/API.cpp
 
-        src/api/Hashmap.h
 
         src/api/TelegramAPI.cpp
-        src/api/TelegramAPI.h
 
         src/api/DynuAPI.cpp
-        src/api/DynuAPI.h
 
         src/api/IPAPI.cpp
-        src/api/IPAPI.h
         )
 
 add_library(logger
         src/Logger.cpp
-        src/Logger.h
         )
 
 
@@ -33,6 +27,9 @@ set(SOURCE
         )
 
 add_executable(iprefresher  ${SOURCE})
+
+# LINK generated LIBS #
 target_link_libraries(iprefresher api logger ${CURL_LIBRARIES} )
 
+# INSTALL to SYSTEM #
 install (TARGETS iprefresher DESTINATION bin)
diff --git a/inc/Logger.h b/inc/Logger.h
new file mode 100644
index 0000000..32ab87f
--- /dev/null
+++ b/inc/Logger.h
@@ -0,0 +1,26 @@
+//
+// Created by lukas on 05.05.19.
+//
+#pragma once
+
+class Logger {
+public:
+    /**
+     * log messages to logfile
+     * @param text message
+     */
+    void logToLogfile(std::string text);
+
+    /**
+     * safe ip to temp file
+     * @param ip ip address to save
+     */
+    void safeip(std::string ip);
+
+    /**
+     * read ip from file
+     * @return read ip
+     */
+    std::string readip();
+
+};
diff --git a/inc/api/API.h b/inc/api/API.h
new file mode 100644
index 0000000..5c3e3c2
--- /dev/null
+++ b/inc/api/API.h
@@ -0,0 +1,32 @@
+//
+// Created by lukas on 06.04.19.
+//
+
+#pragma once
+
+
+#include <string>
+#include "Hashmap.h"
+
+class API {
+public:
+    /**
+     * Simple API get request
+     * @param myurl api url
+     * @return return string of server
+     */
+    std::string request(std::string myurl);
+
+    /**
+     * complex request with post/get and header information support
+     * @param myurl base request url
+     * @param post boolean (false=get)
+     * @param map post/get fields
+     * @param headers header fields
+     * @return return string of server
+     */
+    std::string request(std::string myurl, bool post, Hashmap<std::string, std::string> &map, std::vector<std::string> &headers);
+
+private:
+    static size_t write_data(void *buffer, size_t size, size_t buffersize, FILE *stream);
+};
diff --git a/src/api/DynuAPI.h b/inc/api/DynuAPI.h
similarity index 71%
rename from src/api/DynuAPI.h
rename to inc/api/DynuAPI.h
index fad52a9..ac2df2d 100644
--- a/src/api/DynuAPI.h
+++ b/inc/api/DynuAPI.h
@@ -2,14 +2,18 @@
 // Created by lukas on 18.06.19.
 //
 
-#ifndef IPREFRESHER_DYNUAPI_H
-#define IPREFRESHER_DYNUAPI_H
+#pragma once
 
 
 #include "API.h"
 
 class DynuAPI : API{
 public:
+    /**
+     * refresh the ip of domain on Dynu server
+     * @param ip new ip
+     * @return request status
+     */
     int refreshIp(std::string ip);
 private:
     const std::string dynuapikey = "88vNpMfDhMM2YYDNfWR1DNYfRX9W6fYg";
@@ -17,6 +21,3 @@ private:
     const std::string domainid = "8506047"; //id of the dynu domain
     const std::string domainname = "luki.dynu.net";
 };
-
-
-#endif //IPREFRESHER_DYNUAPI_H
diff --git a/src/api/Hashmap.h b/inc/api/Hashmap.h
similarity index 66%
rename from src/api/Hashmap.h
rename to inc/api/Hashmap.h
index 443bc6b..e55db89 100644
--- a/src/api/Hashmap.h
+++ b/inc/api/Hashmap.h
@@ -2,8 +2,7 @@
 // Created by lukas on 07.04.19.
 //
 
-#ifndef QT5PROJECT_HASHMAP_H
-#define QT5PROJECT_HASHMAP_H
+#pragma once
 
 
 #include <iostream>
@@ -12,12 +11,31 @@
 template<class keytype, class valuetype>
 class Hashmap {
 public:
+    /**
+     * add key-value pair to hashmap
+     * @param key keyvalue
+     * @param value valuevalue
+     */
     void add(keytype key, keytype value);
 
+    /**
+     * get key of specific position
+     * @param position int position
+     * @return responding key object
+     */
     keytype getKey(int position);
 
+    /**
+     * get value of specific position
+     * @param position int position
+     * @return responding value object
+     */
     valuetype getValue(int position);
 
+    /**
+     * get size of Hashmap
+     * @return size of Hashmap
+     */
     int size();
 
 private:
@@ -45,6 +63,3 @@ template<class keytype, class valuetype>
 int Hashmap<keytype, valuetype>::size() {
     return (int) (keys.size());
 }
-
-
-#endif //QT5PROJECT_HASHMAP_H
diff --git a/src/api/IPAPI.h b/inc/api/IPAPI.h
similarity index 56%
rename from src/api/IPAPI.h
rename to inc/api/IPAPI.h
index a8836c4..fbcfd48 100644
--- a/src/api/IPAPI.h
+++ b/inc/api/IPAPI.h
@@ -2,17 +2,16 @@
 // Created by lukas on 18.06.19.
 //
 
-#ifndef IPREFRESHER_IPAPI_H
-#define IPREFRESHER_IPAPI_H
-
+#pragma once
 
 #include <string>
 #include "API.h"
 
 class IPAPI : API{
 public:
+    /**
+     * get global ip of current internet connection
+     * @return  global ip
+     */
     std::string getGlobalIp();
 };
-
-
-#endif //IPREFRESHER_IPAPI_H
diff --git a/src/api/TelegramAPI.h b/inc/api/TelegramAPI.h
similarity index 72%
rename from src/api/TelegramAPI.h
rename to inc/api/TelegramAPI.h
index bd8be49..921ed93 100644
--- a/src/api/TelegramAPI.h
+++ b/inc/api/TelegramAPI.h
@@ -2,8 +2,7 @@
 // Created by lukas on 08.05.19.
 //
 
-#ifndef IPREFRESHER_TELEGRAMAPI_H
-#define IPREFRESHER_TELEGRAMAPI_H
+#pragma once
 
 
 #include <string>
@@ -11,12 +10,13 @@
 
 class TelegramAPI : API {
 public:
+    /**
+     * send telegram Message to predefined destination
+     * @param text message
+     */
     void sendMessage(std::string text);
 
 private:
     const std::string apikey = "717213769:AAHan1nSXhUsxLJAN1Dv8Oc0z8wqwDdYPn4";
     const std::string chatid = "618154204";
 };
-
-
-#endif //IPREFRESHER_TELEGRAMAPI_H
diff --git a/src/Logger.h b/src/Logger.h
deleted file mode 100644
index 67cb87a..0000000
--- a/src/Logger.h
+++ /dev/null
@@ -1,20 +0,0 @@
-//
-// Created by lukas on 05.05.19.
-//
-
-#ifndef IPREFRESHER_LOGGER_H
-#define IPREFRESHER_LOGGER_H
-
-
-class Logger {
-public:
-    void logToLogfile(std::string text);
-
-    void safeip(std::string ip);
-
-    std::string readip();
-
-};
-
-
-#endif //IPREFRESHER_LOGGER_H
diff --git a/src/api/API.cpp b/src/api/API.cpp
index f934fd7..768345b 100644
--- a/src/api/API.cpp
+++ b/src/api/API.cpp
@@ -2,8 +2,8 @@
 // Created by lukas on 06.04.19.
 //
 
-#include "API.h"
-#include "Hashmap.h"
+#include "api/API.h"
+#include "api/Hashmap.h"
 
 #include <string>
 #include <iostream>
diff --git a/src/api/API.h b/src/api/API.h
deleted file mode 100644
index 202a7e4..0000000
--- a/src/api/API.h
+++ /dev/null
@@ -1,23 +0,0 @@
-//
-// Created by lukas on 06.04.19.
-//
-
-#ifndef IPREFRESHER_API_H
-#define IPREFRESHER_API_H
-
-
-#include <string>
-#include "Hashmap.h"
-
-class API {
-public:
-    std::string request(std::string myurl);
-
-    std::string request(std::string myurl, bool post, Hashmap<std::string, std::string> &map, std::vector<std::string> &headers);
-
-private:
-    static size_t write_data(void *buffer, size_t size, size_t buffersize, FILE *stream);
-};
-
-
-#endif //IPREFRESHER_API_H
diff --git a/src/api/DynuAPI.cpp b/src/api/DynuAPI.cpp
index c5f05e0..b21a450 100644
--- a/src/api/DynuAPI.cpp
+++ b/src/api/DynuAPI.cpp
@@ -2,7 +2,7 @@
 // Created by lukas on 18.06.19.
 //
 
-#include "DynuAPI.h"
+#include "api/DynuAPI.h"
 
 int DynuAPI::refreshIp(std:: string ip) {
 
diff --git a/src/api/IPAPI.cpp b/src/api/IPAPI.cpp
index d2005b9..f2c9ca5 100644
--- a/src/api/IPAPI.cpp
+++ b/src/api/IPAPI.cpp
@@ -2,7 +2,7 @@
 // Created by lukas on 18.06.19.
 //
 
-#include "IPAPI.h"
+#include "api/IPAPI.h"
 
 std::string IPAPI::getGlobalIp() {
     return request("https://api.ipify.org");
diff --git a/src/api/TelegramAPI.cpp b/src/api/TelegramAPI.cpp
index c2dd2f8..d70f9d1 100644
--- a/src/api/TelegramAPI.cpp
+++ b/src/api/TelegramAPI.cpp
@@ -2,7 +2,7 @@
 // Created by lukas on 08.05.19.
 //
 
-#include "TelegramAPI.h"
+#include "api/TelegramAPI.h"
 
 void TelegramAPI::sendMessage(std::string text) {
     Hashmap<std::string, std::string> args;