diff --git a/_src/enum-representations.md b/_src/enum-representations.md
index c5c3f15..eda6300 100644
--- a/_src/enum-representations.md
+++ b/_src/enum-representations.md
@@ -40,6 +40,8 @@ In JSON and other self-describing formats, the externally tagged representation
 is often not ideal for readability. Serde provides attributes to select three
 other possible representations.
 
+**Note**: This is the only enums representation that requires neither `std` nor `alloc` Cargo features to be enabled.
+
 ## Internally tagged
 
 ```rust