diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index db04143..b8c2dce 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -7,3 +7,7 @@ If you want to contribute, you need to follow these coding regulations for your
 Please, do not use C# type names. 
 In other words, use `string` instead of `String`,
 use `bool` rather than `Boolean`, etc.
+
+## camelCase
+
+When you define something private or local, name it using camelCase. However, if it is public, use PascalCase.