diff --git a/guides/source/active_record_validations.md b/guides/source/active_record_validations.md
index cb459626d53..7ec4ab312da 100644
--- a/guides/source/active_record_validations.md
+++ b/guides/source/active_record_validations.md
@@ -871,7 +871,7 @@ should happen, an `Array` can be used. Moreover, you can apply both `:if` and
 ```ruby
 class Computer < ActiveRecord::Base
   validates :mouse, presence: true,
-                    if: ["market.retail?", :desktop?]
+                    if: ["market.retail?", :desktop?],
                     unless: Proc.new { |c| c.trackpad.present? }
 end
 ```