diff --git a/ex5-library/src/main.cpp b/ex5-library/src/main.cpp
index 44a56b0..71068a5 100644
--- a/ex5-library/src/main.cpp
+++ b/ex5-library/src/main.cpp
@@ -9,6 +9,7 @@
 #include <iostream>
 #include "Human.h"
 #include "Employee.h"
+#include "Librarian.h"
 
 using namespace std;
 
@@ -20,5 +21,13 @@ int main() {
 	if (e.validate())
 		cout << "pesel of employee" << e.getPesel();
 
+	lib::Librarian l = lib::Librarian();
+	l.setPesel(2000000000);
+	if (l.validate())
+		cout << "pesel of librarian" << l.getPesel();
+	l.setPosition("librarian");
+	if (l.validate())
+		cout << "now it works, pesel of librarian" << l.getPesel();
+
 	return 0;
 }