diff --git a/scss/_close.scss b/scss/_close.scss
index f04cb830eb..e06cfe0d60 100644
--- a/scss/_close.scss
+++ b/scss/_close.scss
@@ -59,16 +59,3 @@
     // OUDS mod: no opacity
   }
 }
-
-// Deprecated in v5.3.3
-// OUDS mod: changing color instead of using filter
-.btn-close-white {
-  --#{$prefix}btn-close-color: #{$btn-close-white-color}; // OUDS mod
-  --#{$prefix}btn-close-bg: #{$btn-close-white-bg}; // OUDS mod
-  --#{$prefix}btn-close-border-color: #{$btn-close-white-border-color}; // OUDS mod
-  --#{$prefix}btn-close-hover-color: #{$btn-close-white-hover-color}; // OUDS mod
-  --#{$prefix}btn-close-active-color: #{$btn-close-white-active-color}; // OUDS mod
-  --#{$prefix}btn-close-active-border-color: #{$btn-close-white-active-border-color}; // OUDS mod
-  --#{$prefix}btn-close-disabled-color: #{$btn-close-white-disabled-color}; // OUDS mod
-}
-// End mod
diff --git a/scss/_variables.scss b/scss/_variables.scss
index b2f28661bf..2b98184612 100644
--- a/scss/_variables.scss
+++ b/scss/_variables.scss
@@ -2226,15 +2226,6 @@ $btn-close-padding-sm:          subtract($btn-icon-padding-x, $spacer * .25) !de
 // End mod
 // scss-docs-end close-variables
 
-// Deprecated in v5.3.3: all `$btn-close-white-*`
-$btn-close-white-color:               $white !default; // OUDS mod
-$btn-close-white-bg:                  transparent !default; // OUDS mod
-$btn-close-white-border-color:        transparent !default; // OUDS mod
-$btn-close-white-hover-color:         $btn-close-white-color !default; // OUDS mod
-$btn-close-white-active-color:        $supporting-orange !default; // OUDS mod
-$btn-close-white-active-border-color: $gray-700 !default; // OUDS mod
-$btn-close-white-disabled-color:      $gray-700 !default; // OUDS mod
-
 // Offcanvas
 
 // scss-docs-start offcanvas-variables
diff --git a/site/content/docs/0.1/migration-from-boosted.md b/site/content/docs/0.1/migration-from-boosted.md
index a64590228b..95fe925bd4 100644
--- a/site/content/docs/0.1/migration-from-boosted.md
+++ b/site/content/docs/0.1/migration-from-boosted.md
@@ -20,3 +20,35 @@ Technically, it means that you can get rid of the following things:
 - Helvetica Neue woff2 files: `fonts/HelvNeue55_W1G.woff2`, `fonts/HelvNeue75_W1G.woff2`, `fonts/HelveticaNeueW20-55Roman.woff2`, and `fonts/HelveticaNeueW20-75Bold.woff2`.
 - `orange-helvetica.*.css` file (default, RTL, or minified version).
 - If you were customizing your Sass compilation, you can remove the `@import "orange-helvetica";` line from your Sass files if it was there.
+
+## Components
+
+- <span class="badge text-bg-warning">Warning</span> `.btn-close-white` class has been removed as it was deprecated in Boosted v5.3.3.
+
+### CSS and Sass variables
+
+- <details class="mb-2">
+    <summary><span class="badge text-bg-warning">Warning</span> Dropped deprecated Sass variables:</summary>
+    <ul>
+      <li><code>$btn-close-white-color</code></li>
+      <li><code>$btn-close-white-bg</code></li>
+      <li><code>$btn-close-white-border-color</code></li>
+      <li><code>$btn-close-white-hover-color</code></li>
+      <li><code>$btn-close-white-active-color</code></li>
+      <li><code>$btn-close-white-active-border-color</code></li>
+      <li><code>$btn-close-white-disabled-color</code></li>
+    </ul>
+  </details>
+
+- <details class="mb-2">
+    <summary><span class="badge text-bg-warning">Warning</span> Dropped deprecated CSS variables:</summary>
+    <ul>
+      <li><code>--bs-btn-close-color</code></li>
+      <li><code>--bs-btn-close-bg</code></li>
+      <li><code>--bs-btn-close-border-color</code></li>
+      <li><code>--bs-btn-close-hover-color</code></li>
+      <li><code>--bs-btn-close-active-color</code></li>
+      <li><code>--bs-btn-close-active-border-color</code></li>
+      <li><code>--bs-btn-close-disabled-color</code></li>
+    </ul>
+  </details>