diff --git a/lib/active_storage/variant.rb b/lib/active_storage/variant.rb
index ba2604eccfe17635a2b15fa05742049c7a9e4ad3..435033f980fc982aa21a078b5bb7aec12cfe2eb6 100644
--- a/lib/active_storage/variant.rb
+++ b/lib/active_storage/variant.rb
@@ -1,6 +1,7 @@
 require "active_storage/blob"
 require "mini_magick"
 
+# Image blobs can have variants that are the result of a set of transformations applied to the original.
 class ActiveStorage::Variant
   attr_reader :blob, :variation
   delegate :service, to: :blob