diff --git a/ChangeLog b/ChangeLog
index 993f94a..1518bad 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2024-05-03  Mert Gör  <mertgor@masscollabs.xyz>
+
+	* Changed the file names with _ underscore one
+
 2024-04-30  Mert Gör  <mertgor@masscollabs.xyz>
 
 	* puts-example.rb: puts example printing string and calculating 4-1
diff --git a/hello-world-two-strings.rb b/hello_world_two_strings.rb
similarity index 100%
rename from hello-world-two-strings.rb
rename to hello_world_two_strings.rb
diff --git a/hello-world-two-strings-newline.rb b/hello_world_two_strings_newline.rb
similarity index 100%
rename from hello-world-two-strings-newline.rb
rename to hello_world_two_strings_newline.rb
diff --git a/puts-example.rb b/puts_example.rb
similarity index 100%
rename from puts-example.rb
rename to puts_example.rb