diff --git a/crates/typst-library/src/model/outline.rs b/crates/typst-library/src/model/outline.rs
index 1e177130d..adca57830 100644
--- a/crates/typst-library/src/model/outline.rs
+++ b/crates/typst-library/src/model/outline.rs
@@ -311,7 +311,7 @@ impl LocalName for Packed<OutlineElem> {
     const KEY: &'static str = "outline";
 }
 
-/// Only used to mark
+/// Only used to delimit the outline in tagged PDF.
 #[elem(Locatable, Show)]
 pub struct OutlineBody {
     #[required]