diff --git a/DEVELOP.md b/DEVELOP.md
index e8e381dd..a2e54552 100644
--- a/DEVELOP.md
+++ b/DEVELOP.md
@@ -2,13 +2,14 @@
 
 Set up a development sandbox.
 
-Acquire sources and install project in editable mode.
+Acquire sources and install project in editable mode, including
+all runtime extensions and development tools.
 ```shell
 git clone https://github.com/kennethreitz/responder
 cd responder
 python3 -m venv .venv
 source .venv/bin/activate
-pip install --editable '.[graphql,develop,release,test]'
+pip install --editable '.[full,develop,release,test]'
 ```
 
 Invoke linter and software tests.