diff --git a/README.md b/README.md
index d73b1c6..69a5206 100644
--- a/README.md
+++ b/README.md
@@ -69,7 +69,10 @@ pip install flashinfer-python -i https://flashinfer.ai/whl/cu128/torch2.9/
 > For other CUDA/PyTorch combinations, see [FlashInfer installation](https://docs.flashinfer.ai/installation.html).
 > If FlashInfer is not installed, the model falls back to SDPA (PyTorch native attention) via `--use_sdpa`.
 
-**5. Visualization dependencies (optional)**
+**5. Optional export and sky-mask dependencies**
+
+The browser point-cloud viewer is installed with the base package. Install the
+optional `vis` extra only if you need GLB export or sky segmentation.
 
 ```bash
 pip install -e ".[vis]"
diff --git a/pyproject.toml b/pyproject.toml
index 29c6fb8..70e7f68 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,10 +12,12 @@ dependencies = [
     "tqdm",
     "scipy",
     "torchvision",
+    "matplotlib",
+    "viser>=0.2.23",
 ]
 
 [project.optional-dependencies]
-vis = ["viser>=0.2.23", "trimesh", "matplotlib", "onnxruntime", "requests"]
+vis = ["trimesh", "onnxruntime", "requests"]
 demo = ["lingbot-map[vis]"]
 
 [build-system]