diff --git a/compiler/rustc_ast/src/ast.rs b/compiler/rustc_ast/src/ast.rs
index 9d543563c0f96..c455900034872 100644
--- a/compiler/rustc_ast/src/ast.rs
+++ b/compiler/rustc_ast/src/ast.rs
@@ -2788,6 +2788,8 @@ pub enum VariantData {
     /// Struct variant.
     ///
     /// E.g., `Bar { .. }` as in `enum Foo { Bar { .. } }`.
+    ///
+    /// The `bool` is whether it was recovered by the parser.
     Struct(ThinVec<FieldDef>, bool),
     /// Tuple variant.
     ///
diff --git a/compiler/rustc_hir/src/hir.rs b/compiler/rustc_hir/src/hir.rs
index d148137091cf4..6aef88b21d536 100644
--- a/compiler/rustc_hir/src/hir.rs
+++ b/compiler/rustc_hir/src/hir.rs
@@ -2848,7 +2848,9 @@ pub enum VariantData<'hir> {
     /// A struct variant.
     ///
     /// E.g., `Bar { .. }` as in `enum Foo { Bar { .. } }`.
-    Struct(&'hir [FieldDef<'hir>], /* recovered */ bool),
+    ///
+    /// The `bool` is whether it was recovered by the parser.
+    Struct(&'hir [FieldDef<'hir>], bool),
     /// A tuple variant.
     ///
     /// E.g., `Bar(..)` as in `enum Foo { Bar(..) }`.