diff --git a/ecsact/detail/grammar.hh b/ecsact/detail/grammar.hh
index 3e710d8..9ebfe28 100644
--- a/ecsact/detail/grammar.hh
+++ b/ecsact/detail/grammar.hh
@@ -366,6 +366,7 @@ namespace ecsact::parse::detail::grammar {
 		static constexpr auto value = lexy::forward<int32_t>;
 	};
 
+	/** @internal */
 	struct field_statement {
 		static constexpr auto name() { return "field statement"; }