diff --git a/lib/rules/subsystem.js b/lib/rules/subsystem.js
index 85b0fb8..07d9d4f 100644
--- a/lib/rules/subsystem.js
+++ b/lib/rules/subsystem.js
@@ -5,6 +5,7 @@ const validSubsystems = [
   'build',
   'bootstrap',
   'cli',
+  'config',
   'deps',
   'doc',
   'errors',