diff --git a/compiler/rustc_middle/src/ty/sty.rs b/compiler/rustc_middle/src/ty/sty.rs
index 0159906bfbc98..87896970ed8f9 100644
--- a/compiler/rustc_middle/src/ty/sty.rs
+++ b/compiler/rustc_middle/src/ty/sty.rs
@@ -61,7 +61,7 @@ pub struct TypeAndMut<'tcx> {
 
 #[derive(Clone, PartialEq, PartialOrd, Eq, Ord, Hash, TyEncodable, TyDecodable, Copy)]
 #[derive(HashStable)]
-/// A "free" region `fr` can be interpreted as "some region
+/// The parameter representation of late-bound function parameters, "some region
 /// at least as big as the scope `fr.scope`".
 pub struct LateParamRegion {
     pub scope: DefId,