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-rw-r--r--guides/source/engines.md1
1 files changed, 1 insertions, 0 deletions
diff --git a/guides/source/engines.md b/guides/source/engines.md
index a00311bffb..0b17137270 100644
--- a/guides/source/engines.md
+++ b/guides/source/engines.md
@@ -1518,6 +1518,7 @@ To hook into the initialization process of one of the following classes use the
| `ActiveJob::Base` | `active_job` |
| `ActiveJob::TestCase` | `active_job_test_case` |
| `ActiveRecord::Base` | `active_record` |
+| `ActiveStorage::Attachment` | `active_storage_attachment` |
| `ActiveStorage::Blob` | `active_storage_blob` |
| `ActiveSupport::TestCase` | `active_support_test_case` |
| `i18n` | `i18n` |