diff --git a/apps/readest.koplugin/syncannotations.lua b/apps/readest.koplugin/syncannotations.lua
index 50e1dad6..005563ca 100644
--- a/apps/readest.koplugin/syncannotations.lua
+++ b/apps/readest.koplugin/syncannotations.lua
@@ -300,6 +300,10 @@ function SyncAnnotations:pull(ui, settings, client, book_hash, meta_hash, dialog
 
                 -- Resolve KOReader page number from xpointer
                 local pageno = ui.document:getPageFromXPointer(xp0) or note.page
+                -- Resolve chapter title so downstream tools can group by chapter,
+                -- matching native KOReader highlight creation behavior.
+                local chapter = ui.toc and ui.toc:getTocTitleByPage(xp0) or nil
+                if chapter == "" then chapter = nil end
 
                 if note_type == "bookmark" then
                     if existing_bookmarks[xp0] then goto continue end
@@ -309,6 +313,7 @@ function SyncAnnotations:pull(ui, settings, client, book_hash, meta_hash, dialog
                         page = xp0,
                         text = note.text or "",
                         note = note.note or "",
+                        chapter = chapter,
                         pageno = pageno,
                         datetime = datetime_str,
                         datetime_updated = datetime_updated_str,
@@ -335,6 +340,7 @@ function SyncAnnotations:pull(ui, settings, client, book_hash, meta_hash, dialog
                         note = note.note or "",
                         drawer = drawer,
                         color = READEST_TO_KO_COLOR[note.color] or "yellow",
+                        chapter = chapter,
                         pageno = pageno,
                         datetime = datetime_str,
                         datetime_updated = datetime_updated_str,