From cc75c6f5d43a4250ad129cced0b846ce7968fba2 Mon Sep 17 00:00:00 2001
From: Martin Robinson <mrobinson@igalia.com>
Date: Thu, 19 Mar 2020 12:43:01 +0100
Subject: [PATCH] layout_2020: Fix a documentation comment

I inadvertently failed to complete this doc comment.
---
 components/layout_2020/fragments.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/components/layout_2020/fragments.rs b/components/layout_2020/fragments.rs
index 70c65dd470d..3be702bbf84 100644
--- a/components/layout_2020/fragments.rs
+++ b/components/layout_2020/fragments.rs
@@ -55,7 +55,9 @@ pub(crate) struct BoxFragment {
     /// The scrollable overflow of this box fragment.
     pub scrollable_overflow_from_children: PhysicalRect<Length>,
 
-    /// XXX Add thsi
+    /// If this fragment was laid out from a hoisted box, this id corresponds to the id stored in
+    /// the AbsoluteOrFixedPositionedFragment left as a placeholder in the tree position of the
+    /// box.
     pub hoisted_fragment_id: Option<HoistedFragmentId>,
 }