diff --git a/kyu_5/number_of_trailing_zeros_of_n/__init__.py b/kyu_5/number_of_trailing_zeros_of_n/__init__.py
index e69de29bb2d..5166371459b 100644
--- a/kyu_5/number_of_trailing_zeros_of_n/__init__.py
+++ b/kyu_5/number_of_trailing_zeros_of_n/__init__.py
@@ -0,0 +1 @@
+"""Number of trailing zeros of N."""
diff --git a/kyu_5/number_of_trailing_zeros_of_n/test_zeros.py b/kyu_5/number_of_trailing_zeros_of_n/test_zeros.py
index 8497849d22a..fc5f97bf087 100644
--- a/kyu_5/number_of_trailing_zeros_of_n/test_zeros.py
+++ b/kyu_5/number_of_trailing_zeros_of_n/test_zeros.py
@@ -1,5 +1,6 @@
 """
-Test for -> Number of trailing zeros of N!
+Test for -> Number of trailing zeros of N!.
+
 Created by Egor Kostan.
 GitHub: https://github.com/ikostan
 """
@@ -27,12 +28,12 @@
     name='Source/Kata')
 # pylint: enable-msg=R0801
 class ZerosTestCase(unittest.TestCase):
-    """
-    Testing zeros function
-    """
+    """Testing zeros function."""
 
     def test_zeros(self):
         """
+        Testing zeros function with various test data.
+
         Testing 'zeros' program that should calculate the number
         of trailing zeros in a factorial of a given number.
         :return: None
diff --git a/kyu_5/number_of_trailing_zeros_of_n/zeros.py b/kyu_5/number_of_trailing_zeros_of_n/zeros.py
index b80999fcce6..d8bab1d3ff5 100644
--- a/kyu_5/number_of_trailing_zeros_of_n/zeros.py
+++ b/kyu_5/number_of_trailing_zeros_of_n/zeros.py
@@ -1,5 +1,6 @@
 """
-Solution for -> Number of trailing zeros of N!
+Solution for -> Number of trailing zeros of N!.
+
 Created by Egor Kostan.
 GitHub: https://github.com/ikostan
 """
@@ -7,8 +8,10 @@
 
 def zeros(n) -> int:
     """
-    A program that will calculate the number of
-    trailing zeros in a factorial of a given number.
+    zeros function.
+
+    A program that calculate the number of trailing
+    zeros in a factorial of a given number.
 
     N! = 1 * 2 * 3 * ... * N