1 files changed, 2 insertions, 0 deletions
diff --git a/app/assets/javascripts/content_editor/services/markdown_serializer.js b/app/assets/javascripts/content_editor/services/markdown_serializer.js
index c990f6cf0b3..958c27c281a 100644
--- a/app/assets/javascripts/content_editor/services/markdown_serializer.js
+++ b/app/assets/javascripts/content_editor/services/markdown_serializer.js
@@ -22,6 +22,7 @@ import Frontmatter from '../extensions/frontmatter';
 import HardBreak from '../extensions/hard_break';
 import Heading from '../extensions/heading';
 import HorizontalRule from '../extensions/horizontal_rule';
+import Highlight from '../extensions/highlight';
 import HTMLMarks from '../extensions/html_marks';
 import HTMLNodes from '../extensions/html_nodes';
 import Image from '../extensions/image';
@@ -78,6 +79,7 @@ const defaultSerializerConfig = {
     [Code.name]: code,
     [Subscript.name]: { open: '<sub>', close: '</sub>', mixable: true },
     [Superscript.name]: { open: '<sup>', close: '</sup>', mixable: true },
+    [Highlight.name]: { open: '<mark>', close: '</mark>', mixable: true },
     [InlineDiff.name]: {
       mixable: true,
       open(_, mark) {