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diff --git a/guides/source/active_record_callbacks.md b/guides/source/active_record_callbacks.md
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--- a/guides/source/active_record_callbacks.md
+++ b/guides/source/active_record_callbacks.md
@@ -319,6 +319,14 @@ class Order < ApplicationRecord
end
```
+As the proc is evaluated in the context of the object, it is also possible to write this as:
+
+```ruby
+class Order < ApplicationRecord
+ before_save :normalize_card_number, if: Proc.new { paid_with_card? }
+end
+```
+
### Multiple Conditions for Callbacks
When writing conditional callbacks, it is possible to mix both `:if` and `:unless` in the same callback declaration: