diff --git a/src/collections/filterUndefined.ts b/src/collections/filterUndefined.ts
index 607dd60..bc023e5 100644
--- a/src/collections/filterUndefined.ts
+++ b/src/collections/filterUndefined.ts
@@ -1,5 +1,8 @@
 import { isDefined } from "../type-checks";
 
+/**
+ * @deprecated Use `.filter(isDefined)` instead
+ */
 export function filterUndefined<T>(arr: (T | null | undefined)[]): T[] {
   return arr.filter((v) => isDefined(v)) as T[];
 }