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-rw-r--r--guides/source/active_support_instrumentation.md12
1 files changed, 7 insertions, 5 deletions
diff --git a/guides/source/active_support_instrumentation.md b/guides/source/active_support_instrumentation.md
index 2be3a1c4e2..03c9183eb3 100644
--- a/guides/source/active_support_instrumentation.md
+++ b/guides/source/active_support_instrumentation.md
@@ -228,11 +228,13 @@ Action View
### render_collection.action_view
-| Key | Value |
-| ------------- | ----------------------------------- |
-| `:identifier` | Full path to template |
-| `:count` | Size of collection |
-| `:cache_hits` | Count of cached partials (optional) |
+| Key | Value |
+| ------------- | ------------------------------------- |
+| `:identifier` | Full path to template |
+| `:count` | Size of collection |
+| `:cache_hits` | Number of partials fetched from cache |
+
+`:cache_hits` is only included if the collection is rendered with `cached: true`.
```ruby
{