diff --git a/readme.md b/readme.md
index 5ededd9..5c7adf2 100644
--- a/readme.md
+++ b/readme.md
@@ -135,6 +135,8 @@ for (const property of deepKeys(user)) {
 }
 ```
 
+Sparse arrays are supported, but holes are filled. In general, [avoid using sparse arrays](https://github.com/sindresorhus/dot-prop/issues/109#issuecomment-1614819869).
+
 #### object
 
 Type: `object | array`