diff --git a/site/content/docs/5.1/helpers/stacks.md b/site/content/docs/5.1/helpers/stacks.md
index 20ca86aa03..e1960c5739 100644
--- a/site/content/docs/5.1/helpers/stacks.md
+++ b/site/content/docs/5.1/helpers/stacks.md
@@ -4,6 +4,7 @@ title: Stacks
description: Shorthand helpers that build on top of our flexbox utilities to make component layout faster and easier than ever.
group: helpers
toc: true
+added: "5.1"
---
Stacks offer a shortcut for applying a number of flexbox properties to quickly and easily create layouts in Bootstrap. All credit for the concept and implementation goes to the open source [Pylon project](https://almonk.github.io/pylon/).
diff --git a/site/content/docs/5.1/helpers/vertical-rule.md b/site/content/docs/5.1/helpers/vertical-rule.md
index 8d0d6141f8..b734f61d46 100644
--- a/site/content/docs/5.1/helpers/vertical-rule.md
+++ b/site/content/docs/5.1/helpers/vertical-rule.md
@@ -4,6 +4,7 @@ title: Vertical rule
description: Use the custom vertical rule helper to create vertical dividers like the `
` element.
group: helpers
toc: true
+added: "5.1"
---
## How it works
diff --git a/site/content/docs/5.1/utilities/opacity.md b/site/content/docs/5.1/utilities/opacity.md
index a2fdc38071..5cc4c225fa 100644
--- a/site/content/docs/5.1/utilities/opacity.md
+++ b/site/content/docs/5.1/utilities/opacity.md
@@ -3,6 +3,7 @@ layout: docs
title: Opacity
description: Control the opacity of elements.
group: utilities
+added: "5.1"
---
The `opacity` property sets the opacity level for an element. The opacity level describes the transparency level, where `1` is not transparent at all, `.5` is 50% visible, and `0` is completely transparent.
diff --git a/site/layouts/partials/docs-versions.html b/site/layouts/partials/docs-versions.html
index dd234c387b..4e81c61261 100644
--- a/site/layouts/partials/docs-versions.html
+++ b/site/layouts/partials/docs-versions.html
@@ -1,22 +1,34 @@
{{- $url := split .Permalink "/" -}}
+{{- $page_version := index $url (sub (len $url) 4) -}}
{{- $group_slug := index $url (sub (len $url) 3) -}}
{{- $page_slug := index $url (sub (len $url) 2) -}}
+{{- $versions_link := "" -}}
+{{- if and (eq .Layout "docs") (eq $page_version .Site.Params.docs_version) -}}
+ {{- .Scratch.Set "versions_link" (printf "%s/%s/" $group_slug $page_slug) -}}
+{{- else if (eq .Layout "single") }}
+ {{- .Scratch.Set "versions_link" (printf "%s/" $page_slug) -}}
+{{- end }}
+
Bootstrap v{{ .Site.Params.docs_version }}