diff --git a/lib/components/document/src/BookmarkRangeEnd.ts b/lib/components/document/src/BookmarkRangeEnd.ts
index a852a1d..f7a66f0 100644
--- a/lib/components/document/src/BookmarkRangeEnd.ts
+++ b/lib/components/document/src/BookmarkRangeEnd.ts
@@ -1,7 +1,7 @@
 import type { Bookmark } from '../../../classes/src/Bookmarks.ts';
 import {
-	type ComponentAncestor,
 	Component,
+	type ComponentAncestor,
 } from '../../../classes/src/Component.ts';
 import { registerComponent } from '../../../utilities/src/components.ts';
 import { create } from '../../../utilities/src/dom.ts';
@@ -17,12 +17,12 @@ export type BookmarkRangeEndChild = never;
  * A type describing the props accepted by {@link BookmarkRangeEnd}.
  */
 export type BookmarkRangeEndProps =
-	| { bookmark: Bookmark; id?: never }
+	| { bookmark: Bookmark; id?: never; displaced?: 'next' | 'prev' | null }
 	// Deprecate this way:
-	| { bookmark?: never; id: number };
+	| { bookmark?: never; id: number; displaced?: 'next' | 'prev' | null };
 
 /**
- * The end of a range associated with a comment.
+ * The end of a range associated with a bookmark.
  */
 export class BookmarkRangeEnd extends Component<
 	BookmarkRangeEndProps,
@@ -39,10 +39,14 @@ export class BookmarkRangeEnd extends Component<
 	public override toNode(_ancestry: ComponentAncestor[]): Node {
 		return create(
 			`element ${QNS.w}bookmarkEnd {
-				attribute ${QNS.w}id { $id }
+				attribute ${QNS.w}id { $id },
+				if (exists($displaced)) then attribute ${QNS.w}displacedByCustomXml { $displaced } else ()
 			}`,
-			this.props.bookmark || {
-				id: this.props.id,
+			{
+				id: this.props.bookmark
+					? this.props.bookmark.id
+					: this.props.id,
+				displaced: this.props.displaced || null,
 			}
 		);
 	}
@@ -58,14 +62,19 @@ export class BookmarkRangeEnd extends Component<
 	 * Instantiate this component from the XML in an existing DOCX file.
 	 */
 	static override fromNode(node: Node): BookmarkRangeEnd {
-		return new BookmarkRangeEnd(
-			evaluateXPathToMap<BookmarkRangeEndProps>(
-				`map {
-					"id": ./@${QNS.w}id/number()
-				}`,
-				node
-			)
+		const props = evaluateXPathToMap<BookmarkRangeEndProps>(
+			`map {
+				"id": ./@${QNS.w}id/number(),
+				"displaced": ./@${QNS.w}displacedByCustomXml/string()
+			}`,
+			node
 		);
+
+		if (!props.displaced) {
+			props.displaced = undefined;
+		}
+
+		return new BookmarkRangeEnd(props);
 	}
 }
 
diff --git a/lib/components/document/src/BookmarkRangeStart.ts b/lib/components/document/src/BookmarkRangeStart.ts
index 14aaae7..b222c80 100644
--- a/lib/components/document/src/BookmarkRangeStart.ts
+++ b/lib/components/document/src/BookmarkRangeStart.ts
@@ -22,12 +22,14 @@ export type BookmarkRangeStartProps =
 			bookmark: Bookmark;
 			id?: never;
 			name?: never;
+			displaced?: 'next' | 'prev' | null;
 	  }
 	// Deprecate this way:
 	| {
 			bookmark?: never;
 			id: number;
 			name: string;
+			displaced?: 'next' | 'prev' | null;
 	  };
 
 /**
@@ -49,11 +51,17 @@ export class BookmarkRangeStart extends Component<
 		return create(
 			`element ${QNS.w}bookmarkStart {
 				attribute ${QNS.w}id { $id },
-				attribute ${QNS.w}name { $name }
+				attribute ${QNS.w}name { $name },
+				if (exists($displaced)) then attribute ${QNS.w}displacedByCustomXml { $displaced } else ()
 			}`,
-			this.props.bookmark || {
-				id: this.props.id,
-				name: this.props.name,
+			{
+				id: this.props.bookmark
+					? this.props.bookmark.id
+					: this.props.id,
+				name: this.props.bookmark
+					? this.props.bookmark.name
+					: this.props.name,
+				displaced: this.props.displaced || null,
 			}
 		);
 	}
@@ -75,11 +83,16 @@ export class BookmarkRangeStart extends Component<
 		const props = evaluateXPathToMap<BookmarkRangeStartProps>(
 			`map {
 				"id": ./@${QNS.w}id/number(),
-				"name": ./@${QNS.w}name/string()
-				}`,
+				"name": ./@${QNS.w}name/string(),
+				"displaced": ./@${QNS.w}displacedByCustomXml/string()
+			}`,
 			node
 		);
 
+		if (!props.displaced) {
+			props.displaced = undefined;
+		}
+
 		context.bookmarks?.registerIdentifier(props.id!, props.name);
 		return new BookmarkRangeStart(props);
 	}
diff --git a/lib/components/document/test/BookmarkRangeEnd.test.ts b/lib/components/document/test/BookmarkRangeEnd.test.ts
new file mode 100644
index 0000000..1ffd263
--- /dev/null
+++ b/lib/components/document/test/BookmarkRangeEnd.test.ts
@@ -0,0 +1,55 @@
+import { expect } from 'std/expect';
+import { describe, it } from 'std/testing/bdd';
+
+import { create, serialize } from '../../../utilities/src/dom.ts';
+import { NamespaceUri } from '../../../utilities/src/namespaces.ts';
+import { BookmarkRangeEnd } from '../src/BookmarkRangeEnd.ts';
+
+describe('BookmarkRangeEnd', () => {
+	it('parses id from XML', () => {
+		const node = create(`
+			<w:bookmarkEnd xmlns:w="${NamespaceUri.w}" w:id="3" />
+		`);
+		const component = BookmarkRangeEnd.fromNode(node);
+		expect(component.props.id).toBe(3);
+	});
+
+	it('serializes back to XML correctly', () => {
+		const node = create(`
+			<w:bookmarkEnd xmlns:w="${NamespaceUri.w}" w:id="1" />
+		`);
+		const component = BookmarkRangeEnd.fromNode(node);
+		const output = serialize(component.toNode([]));
+		expect(output).toContain('id="1"');
+	});
+
+	it('parses the displaced prop from XML', () => {
+		const node = create(`
+			<w:bookmarkEnd xmlns:w="${NamespaceUri.w}" w:id="4" w:displacedByCustomXml="prev" />
+		`);
+		const component = BookmarkRangeEnd.fromNode(node);
+		expect(component.props.displaced).toBe('prev');
+	});
+
+	it('serializes the displaced prop to XML', () => {
+		const component = new BookmarkRangeEnd({
+			id: 2,
+			displaced: 'next',
+		});
+		const output = serialize(component.toNode([]));
+		expect(output).toContain('displacedByCustomXml="next"');
+	});
+
+	it('omits the displaced attribute when not set', () => {
+		const component = new BookmarkRangeEnd({ id: 3 });
+		const output = serialize(component.toNode([]));
+		expect(output).not.toContain('displacedByCustomXml');
+	});
+
+	it('matches a w:bookmarkEnd node', () => {
+		const node = create(
+			`<w:bookmarkEnd xmlns:w="${NamespaceUri.w}" w:id="1" />`
+		);
+		expect(BookmarkRangeEnd.matchesNode(node)).toBe(true);
+	});
+});
diff --git a/lib/components/document/test/BookmarkRangeStart.test.ts b/lib/components/document/test/BookmarkRangeStart.test.ts
index b21a364..b6be601 100644
--- a/lib/components/document/test/BookmarkRangeStart.test.ts
+++ b/lib/components/document/test/BookmarkRangeStart.test.ts
@@ -99,4 +99,37 @@ describe('BookmarkRangeStart', () => {
 		expect(output).toContain('id="1"');
 		expect(output).toContain('name="test_bm"');
 	});
+
+	it('parses the displaced prop from XML', () => {
+		const bookmarks = new Bookmarks();
+		const context: ComponentContext = {
+			archive: new Archive(),
+			relationships: null,
+			bookmarks,
+		};
+		const node = create(`
+			<w:bookmarkStart xmlns:w="${NamespaceUri.w}" w:id="4" w:name="displaced_bm" w:displacedByCustomXml="next" />
+		`);
+		const component = BookmarkRangeStart.fromNode(node, context);
+		expect(component.props.displaced).toBe('next');
+	});
+
+	it('serializes the displaced prop to XML', () => {
+		const component = new BookmarkRangeStart({
+			id: 2,
+			name: 'displaced_bm',
+			displaced: 'prev',
+		});
+		const output = serialize(component.toNode([]));
+		expect(output).toContain('displacedByCustomXml="prev"');
+	});
+
+	it('omits the displaced attribute when not set', () => {
+		const component = new BookmarkRangeStart({
+			id: 3,
+			name: 'plain_bm',
+		});
+		const output = serialize(component.toNode([]));
+		expect(output).not.toContain('displacedByCustomXml');
+	});
 });