diff --git a/README.md b/README.md
index 6c39ee5..e6fc5f2 100644
--- a/README.md
+++ b/README.md
@@ -123,6 +123,9 @@ $width = $size->width;
 $height = $size->height;
 ```
 
+> [!NOTE]
+> $directoryToWhereImagesShouldBeStored must be an existing directory
+
 Save all pages to images:
 
 ```php