diff --git a/src/bootstrap/doc.rs b/src/bootstrap/doc.rs
index e42d4fcd8647..326a6fdaa80f 100644
--- a/src/bootstrap/doc.rs
+++ b/src/bootstrap/doc.rs
@@ -649,6 +649,7 @@ fn run(self, builder: &Builder<'_>) {
 
         cargo.rustdocflag("--document-private-items");
         cargo.rustdocflag("--enable-index-page");
+        cargo.rustdocflag("--show-type-layout");
         cargo.rustdocflag("-Zunstable-options");
         builder.run(&mut cargo.into());
     }