diff --git a/docs/install/source.md b/docs/install/source.md
index 7c7f9a26411..d2ae2a889eb 100644
--- a/docs/install/source.md
+++ b/docs/install/source.md
@@ -29,10 +29,10 @@ cd lodestar
 
 ## Install packages
 
-Install across all packages. Lodestar follows a [monorepo](https://github.com/lerna/lerna) structure, so all commands below must be run in the project root. Use the `--ignore-optional` flag to prevent downloading the Ethereum Consensus spec tests.
+Install across all packages. Lodestar follows a [monorepo](https://github.com/lerna/lerna) structure, so all commands below must be run in the project root.
 
 ```bash
-yarn install --ignore-optional
+yarn install
 ```
 
 ## Build source code