diff --git a/CODE_STYLE.md b/CODE_STYLE.md
index 6a7a505..2406215 100644
--- a/CODE_STYLE.md
+++ b/CODE_STYLE.md
@@ -76,7 +76,7 @@ impl<'a> AnswerCallbackQuery<'a> {
 
 **Rationale:** `Self` is generally shorter and it's easier to copy-paste code or rename the type.
 
-## Deriving traits
+## Deriving traits (apply only to libraries)
 
 Derive `Debug`, `Clone`, `Copy`, `PartialEq`, `Eq` and `Hash` for public types when possible (in this order).