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-rw-r--r--guides/source/active_support_instrumentation.md4
1 files changed, 2 insertions, 2 deletions
diff --git a/guides/source/active_support_instrumentation.md b/guides/source/active_support_instrumentation.md
index 46fb2f7d6a..f67edefd86 100644
--- a/guides/source/active_support_instrumentation.md
+++ b/guides/source/active_support_instrumentation.md
@@ -246,8 +246,8 @@ INFO. The adapters will add their own data as well.
| `:name` | Record's class |
| `:connection_id` | `self.object_id` |
-ActionMailer
-------------
+Action Mailer
+-------------
### receive.action_mailer