diff --git a/kyu_6/a_rule_of_divisibility_by_13/thirt.py b/kyu_6/a_rule_of_divisibility_by_13/thirt.py
index c94eef2fa9c..3288a6ddfd2 100644
--- a/kyu_6/a_rule_of_divisibility_by_13/thirt.py
+++ b/kyu_6/a_rule_of_divisibility_by_13/thirt.py
@@ -1,5 +1,6 @@
 """
-Solution for -> A Rule of Divisibility by 13
+Solution for -> A Rule of Divisibility by 13.
+
 Created by Egor Kostan.
 GitHub: https://github.com/ikostan
 """
@@ -9,6 +10,8 @@
 
 def thirt(n: int) -> int:
     """
+    Rule of Divisibility by 13.
+
     The function which processes this sequence of operations
     on an integer n (>=0). `thirt` will return the stationary number.
     :param n: int