diff --git a/converter.py b/converter.py
index f561863cd8e5f9687be6295eba06ca8eeb432cf5..88d52c0e1e566446d9d0e68debd6152b33de0f45 100644
--- a/converter.py
+++ b/converter.py
@@ -26,7 +26,7 @@ class IConverter(ABC):
 
 class Converter(IConverter):
     def convert(self, num: int) -> str:
-        roman_numbers = [(9, 'IX'), (5, 'V'), (4, 'IV'), (1, 'I')]
+        roman_numbers = [(10, 'X'), (9, 'IX'), (5, 'V'), (4, 'IV'), (1, 'I')]
         
         roman_str = ''
 
@@ -66,6 +66,10 @@ class TestConverter(unittest.TestCase):
         res = self.c.convert(9)
         self.assertEqual(res, 'IX')
 
+    def test_convertTwo(self):
+        res = self.c.convert(10)
+        self.assertEqual(res, 'X')
+