Update README.md

README.md

@@ -35,6 +35,14 @@ Contains only the core metadata:
 - `url`: The URL being analyzed.
 - `first_seen`: The timestamp when the URL was first observed.
 - `label`: The classification label (`malware`, `phishing`, or `benign`).
+## Important Notes on Splitting
+
+Although Hugging Face shows each loaded file under the `"train"` split by default, this dataset **does not include predefined train/validation/test splits**. 
+
+Instead, the intended splitting strategy is described in detail in our [paper](#citation). In brief, we recommend splitting the data **chronologically by the `first_seen` field**, so that evaluation is performed on newer, unseen URLs — simulating real-world deployment.
+
+Each subset (`urls_with_dns` and `urls_without_dns`) is designed to be loaded independently, as shown below.
+
 
 ## How to Load
 
@@ -54,6 +62,7 @@ ds_without_dns = load_dataset(
 )
 ```
 
+
 ## License
 
 This dataset is available under the CC BY-NC 4.0 License.