doc(k8s): add building note for missing classes (#254)
diff --git a/README.md b/README.md
index 9b39c54..cf5fa5e 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,10 @@
3. [hugegraph-commons](https://github.com/apache/hugegraph-commons) (include common & rpc module)
4. [hugegraph-website](https://github.com/apache/hugegraph-doc) (include doc & website code)
+## Note
+
+- If some classes under computer-k8s cannot be found, you need to execute `mvn clean install` in advance to generate corresponding classes.
+
## Contributing
Welcome to contribute, please see [`How to Contribute`](https://github.com/apache/hugegraph/blob/master/CONTRIBUTING.md) for more information
