diff --git a/packages/block-editor/src/components/block-patterns-list/index.js b/packages/block-editor/src/components/block-patterns-list/index.js
index 62ee0ca35f05c2..f15b71f13f5872 100644
--- a/packages/block-editor/src/components/block-patterns-list/index.js
+++ b/packages/block-editor/src/components/block-patterns-list/index.js
@@ -138,6 +138,7 @@ function BlockPatternList( {
 				return isShown ? (
 					<BlockPattern
 						key={
+							// User added unsynced patterns do not have a unique name so we use the id instead.
 							pattern.name === 'core/block'
 								? pattern.id
 								: pattern.name