diff --git a/src/main/java/de/metas/ui/web/view/ViewRow.java b/src/main/java/de/metas/ui/web/view/ViewRow.java
index 699a3fda4..2ff525790 100644
--- a/src/main/java/de/metas/ui/web/view/ViewRow.java
+++ b/src/main/java/de/metas/ui/web/view/ViewRow.java
@@ -259,6 +259,9 @@ public DocumentId getRowId()
 				}
 				else
 				{
+					// NOTE: we have to do this because usually, the root row can have the same ID as one of the included rows,
+					// because the root/aggregated rows are build on demand and they don't really exist in database.
+					// Also see https://github.com/metasfresh/metasfresh-webui-frontend/issues/835#issuecomment-307783959
 					_rowIdEffective = DocumentId.ofString("D" + rowId.toJson());
 				}
 			}