diff --git a/src/nodes/Date.Set.ts b/src/nodes/Date.Set.ts
index 1d67a41..a8741d6 100644
--- a/src/nodes/Date.Set.ts
+++ b/src/nodes/Date.Set.ts
@@ -24,6 +24,7 @@ export const module: ModuleDefinition<P, R> = {
             schema: { type: 'any' },
             attributes: {
                 valuePlaceholder: 'now',
+                description: 'Use a stable and valid ISO 8601 date string such as `2025-01-01T00:00:00Z` to avoid unintended rollovers.',
             },
         },
         year: {