diff --git a/HW4/include/print_ip.h b/HW4/include/print_ip.h
index fd288e9..bd05984 100644
--- a/HW4/include/print_ip.h
+++ b/HW4/include/print_ip.h
@@ -8,7 +8,7 @@
 /// Function print_ip prints a single value.
 /// 
 /// This is an overloaded function that prints value of integral types.
-/// @param v Integer value to print
+/// @param v Integer value to print.
 template<typename T, std::enable_if_t<std::is_integral_v<T>, bool> = false>
 void print_ip(const T& v)
 {
@@ -24,12 +24,21 @@ void print_ip(const T& v)
     }
 }
 
+/// Function print_ip prints a single value.
+///
+/// This is an overloaded function that prints value of std::string.
+/// @param str String to print.
 template<typename T, std::enable_if_t<std::is_same_v<std::string, T>, bool> = false>
 void print_ip(const T& str)
 {
     std::cout << str;
 }
 
+/// Function print_ip prints a single value.
+///
+/// This is an overloaded function that prints value stored in container that supports one-directional const iterator
+/// (for example, std::list and std::vector).
+/// @param c Container to print.
 template<typename T, std::enable_if_t<(sizeof(typename T::const_iterator) > 0) && !std::is_same_v<std::string, T>, bool> = false>
 void print_ip(const T& c)
 {
@@ -73,6 +82,10 @@ void print_tuple(const std::tuple<Ts...>& tuple)
 
 } // namespace details
 
+/// Function print_ip prints a single value.
+///
+/// This is an overloaded function that prints value stored in tuple. Note: tuple has to has elements of the single type.
+/// @param tuple Tuple to print.
 template<typename... Ts, std::enable_if_t<(sizeof...(Ts) > 0), bool> = false>
 void print_ip(const std::tuple<Ts...>& tuple)
 {
diff --git a/HW4/src/main.cpp b/HW4/src/main.cpp
index 43dc8f9..81cdaaa 100644
--- a/HW4/src/main.cpp
+++ b/HW4/src/main.cpp
@@ -20,18 +20,19 @@ void print_ip_with_endl(const T& v)
     std::cout << std::endl;
 }
 
-int main() {
+int main()
+{
     print_ip_with_endl(int8_t { -1 });                           // 255
     print_ip_with_endl(int16_t { 0 });                           // 0.0
     print_ip_with_endl(int32_t { 2130706433 });                  // 127.0.0.1
     print_ip_with_endl(int64_t { 8875824491850138409 });         // 123.45.67.89.101.112.131.41
-    print_ip_with_endl(std::string {"Hello, World !"});          // Hello, World!
+    print_ip_with_endl(std::string { "Hello, World !" });        // Hello, World!
     print_ip_with_endl(std::vector<int> { 100, 200, 300, 400 }); // 100.200.300.400
-    print_ip_with_endl(std::list<short> { 400, 300, 200, 100 });  // 400.300.200.100
+    print_ip_with_endl(std::list<short> { 400, 300, 200, 100 }); // 400.300.200.100
     print_ip_with_endl(std::make_tuple(123, 456, 789, 0));       // 123.456.789.0
 
-    //std::tuple t2 { 9, true };
-    //print_ip(t2); // Fail to compile.
+    // std::tuple t2 { 9, true };
+    // print_ip(t2); // Fail to compile.
 
     return 0;
 }