diff --git a/project_euler/problem_29/solution.py b/project_euler/problem_29/sol1.py
similarity index 97%
rename from project_euler/problem_29/solution.py
rename to project_euler/problem_29/sol1.py
index 4313a7b06392..726bcaf6ebd8 100644
--- a/project_euler/problem_29/solution.py
+++ b/project_euler/problem_29/sol1.py
@@ -16,7 +16,7 @@
 """
 
 
-def solution(n):
+def solution(n: int = 100) -> int:
     """Returns the number of distinct terms in the sequence generated by a^b
     for 2 <= a <= 100 and 2 <= b <= 100.