diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 278f79ddc48..985f2fe9d6d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -48,6 +48,7 @@ Password (again): ***
 - Install UI packages and start UI debug server:
 ```sh
 cd cvat-core && npm install
+cd ../cvat-canvas && npm install
 cd ../cvat-ui && npm install
 npm start
 ```