diff --git a/lib/rules/subsystem.js b/lib/rules/subsystem.js
index f44a5c6..121fe1c 100644
--- a/lib/rules/subsystem.js
+++ b/lib/rules/subsystem.js
@@ -6,6 +6,7 @@ const validSubsystems = [
   'benchmark'
 , 'build'
 , 'bootstrap'
+, 'cli'
 , 'deps'
 , 'doc'
 , 'errors'