diff --git a/frontend/src/lib/geschichte/JourneyItemCard.svelte b/frontend/src/lib/geschichte/JourneyItemCard.svelte
index 0706fd9d..9faa7889 100644
--- a/frontend/src/lib/geschichte/JourneyItemCard.svelte
+++ b/frontend/src/lib/geschichte/JourneyItemCard.svelte
@@ -11,6 +11,7 @@ interface Props {
 
 let { item }: Props = $props();
 
+// Safe: JourneyReader filters out items where document === null before rendering this component.
 const doc = $derived(item.document!);
 const formattedDate = $derived(doc.documentDate ? formatDate(doc.documentDate, 'short') : null);
 const ariaLabel = $derived(