[ci skip] Improve comment minitest plugin initialization.

Didn't feel we were clear enough about our motivation for placing Rails first
and why we needed to call `load_plugins`.

1 files changed, 4 insertions, 2 deletions

diff --git a/railties/lib/rails/test_unit/minitest_plugin.rb b/railties/lib/rails/test_unit/minitest_plugin.rb
index 5a24bcf288..e9195d5b4e 100644
--- a/railties/lib/rails/test_unit/minitest_plugin.rb
+++ b/railties/lib/rails/test_unit/minitest_plugin.rb
@@ -93,7 +93,9 @@ module Minitest
   mattr_accessor(:run_with_rails_extension) { false }
 end
 
-# Let libraries override our reporter setup by loading other plugins then
-# setting ourselves as the first plugin to be initialized.
+# Put Rails as the first plugin minitest initializes so other plugins
+# can override or replace our default reporter setup.
+# Since minitest only loads plugins if its extensions are empty we have
+# to call `load_plugins` first.
 Minitest.load_plugins
 Minitest.extensions.unshift 'rails'