diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 2e3ff1d6b..4c2bd0441 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -34,6 +34,10 @@ nav_order: 5
 
     *Javier Aranda*
 
+* Allow rendering `with_collection` to accept an optional `spacer_component` to be rendered between each item.
+
+    *Nick Coyne*
+
 ## 3.17.0
 
 * Use struct instead openstruct in lib code.
diff --git a/docs/guide/collections.md b/docs/guide/collections.md
index 0f97f5a80..3f823de6a 100644
--- a/docs/guide/collections.md
+++ b/docs/guide/collections.md
@@ -113,6 +113,9 @@ end
 
 ## Spacer Components
 
+Since 3.18.0
+{: .label }
+
 You can also specify a component to be rendered between instances of the main component by using the :spacer_component option:
 
 ```erb