diff --git a/src/attributes.rst b/src/attributes.rst
index 62163634..78c193ac 100644
--- a/src/attributes.rst
+++ b/src/attributes.rst
@@ -1308,6 +1308,7 @@ Attribute ``repr``
    RepresentationKind ::=
        PrimitiveRepresentation
      | $$C$$
+     | $$Rust$$
      | $$transparent$$
 
    Alignment ::=