diff --git a/README.rst b/README.rst
index e1f178cb..cca0aebd 100644
--- a/README.rst
+++ b/README.rst
@@ -309,7 +309,7 @@ the recipe:
 * The package must have a registered bundle in the manifest if type is "symfony-bundle";
 * The package does not only register a bundle for all environments;
 * All text files should end with a newline;
-* All file names should use the underscore notation;
+* All configuration file names under `etc` should use the underscore notation;
 * The Symfony website must be referenced using HTTPs.
 
 Full Example