diff --git a/Coding-style-policy.md b/Coding-style-policy.md
index 6c943ed..4fee7ac 100644
--- a/Coding-style-policy.md
+++ b/Coding-style-policy.md
@@ -4,7 +4,7 @@ RSS-Bridge uses [Travis-CI](https://travis-ci.org/) to validate code quality. Yo
 
 # Use tabs for indentation
 
-RSS-Bridge uses tabs for indentation on all PHP files in the repository.
+RSS-Bridge uses tabs for indentation on all PHP files in the repository (except files located in the `vendor` directory`)
 
 _Reference_: [`Generic.WhiteSpace.DisallowSpaceIndent`](https://github.com/squizlabs/PHP_CodeSniffer/blob/master/src/Standards/Generic/Sniffs/WhiteSpace/DisallowSpaceIndentSniff.php)