diff --git a/config/basic.rb b/config/basic.rb
index c696bfb..e12bfaa 100644
--- a/config/basic.rb
+++ b/config/basic.rb
@@ -7,7 +7,12 @@ require "pathname"
 
 Dir.chdir Pathname.new(__FILE__).realpath + "../.."
 
-# Load local config if it exists.
+# Load custom config.
+
+load File.expand_path "../boxen.rb", __FILE__
+
+# Load local config if it exists. This file is ignored by Git, and can
+# be used for personal config.
 
 local = File.expand_path "../local.rb", __FILE__
 load local if File.file? local
diff --git a/config/boxen.rb b/config/boxen.rb
new file mode 100644
index 0000000..dd5460f
--- /dev/null
+++ b/config/boxen.rb
@@ -0,0 +1,2 @@
+# This file will be loaded by config/basic early in a Boxen run. Use
+# it to provide any custom code or behavior your Boxen setup requires.