diff --git a/guides/source/active_support_instrumentation.md b/guides/source/active_support_instrumentation.md
index 9d9f40e956b..1da568f9dbb 100644
--- a/guides/source/active_support_instrumentation.md
+++ b/guides/source/active_support_instrumentation.md
@@ -307,7 +307,7 @@ Action Mailer
 }
 ```
 
-ActiveResource
+Active Resource
 --------------
 
 ### request.active_resource