diff --git a/src/vs/workbench/browser/parts/editor2/media/nextTitleControl.css b/src/vs/workbench/browser/parts/editor2/media/nextTitleControl.css
index 686bd8d45a1fb3b1f384dbcbc0f3eef08bf23908..dc2c78bc9e28564299789763afa1b869d349cca5 100644
--- a/src/vs/workbench/browser/parts/editor2/media/nextTitleControl.css
+++ b/src/vs/workbench/browser/parts/editor2/media/nextTitleControl.css
@@ -84,6 +84,8 @@
 	background: url('close-inverse.svg') center center no-repeat;
 }
 
+/** TODO@grid revisit the split editor action (vertical-layout/horizontal-layout does not exist anymore) */
+
 .monaco-workbench > .part.editor > .content.vertical-layout .editor-group-container > .title .split-editor-action {
 	background: url('split-editor-vertical.svg') center center no-repeat;
 }