diff --git a/README.md b/README.md
index 99be11b..be259ce 100644
--- a/README.md
+++ b/README.md
@@ -32,3 +32,11 @@ Please refer to test files for detailed usage.
 - JSON encoder for `Argument` and `Variant` classes
 - Generate [JSON schema](https://json-schema.org/) from an `Argument`, which can be further integrated with JSON editors such as [Visual Studio Code](https://code.visualstudio.com/)
 - Load dict values from external JSON/YAML files via the `$ref` key
+
+## Notebook support
+
+Install the optional IPython dependency before importing `dargs.notebook`:
+
+```bash
+python -m pip install "dargs[notebook]"
+```
diff --git a/pyproject.toml b/pyproject.toml
index d63fc50..38289ca 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,6 +28,9 @@ documentation = "https://docs.deepmodeling.com/projects/dargs"
 repository = "https://github.com/deepmodeling/dargs"
 
 [project.optional-dependencies]
+notebook = [
+    "ipython",
+]
 test = [
     "ipython",
     "jsonschema",