diff --git a/deprecations.js b/deprecations.js
index d302564b..ee71bf8e 100644
--- a/deprecations.js
+++ b/deprecations.js
@@ -7,6 +7,7 @@ const versionDeprecations = {
   '16.0.0': [
     {
       selectors: [
+        '.btn-blue',
         '.markdown-body li',
         '.input-dark',
         '.input-dark:-ms-input-placeholder',
diff --git a/docs/content/support/v16-migration.mdx b/docs/content/support/v16-migration.mdx
index 86826e86..4429d2a5 100644
--- a/docs/content/support/v16-migration.mdx
+++ b/docs/content/support/v16-migration.mdx
@@ -13,6 +13,12 @@ Because colors differ in each color mode, it doesn't make sense to try to make a
 
 Most components don't need to be updated and should work without making changes. But some of the componets that use presentational class names now use functional class names.
 
+#### Buttons
+
+| `v15`       | `v16` |
+| ----------- | ----- |
+| `.btn-blue` | n/a   |
+
 #### Counters
 
 | [`v15`](https://primer.style/css/components/labels#counters) | `v16`                 |
diff --git a/src/buttons/button.scss b/src/buttons/button.scss
index e0563fb3..9044887e 100644
--- a/src/buttons/button.scss
+++ b/src/buttons/button.scss
@@ -109,7 +109,6 @@
 
 // Primary button
 
-.btn-blue, // TODO: deprecate
 .btn-primary {
   color: var(--color-btn-primary-text);
   background-color: var(--color-btn-primary-bg);