diff --git a/docs/4.0/migration.md b/docs/4.0/migration.md
index b7568bbe58..6b34a093e0 100644
--- a/docs/4.0/migration.md
+++ b/docs/4.0/migration.md
@@ -100,6 +100,7 @@ New to Bootstrap 4 is the [Reboot]({{ site.baseurl }}/docs/{{ site.docs_version
 - Dropped `.form-group-*` classes for simplicity's sake. Use `.form-control-*` classes instead now.
 - Dropped `.help-block` and replaced it with `.form-text` for block-level help text. For inline help text and other flexible options, use utility classes like `.text-muted`.
 - Dropped `.radio-inline` and `.checkbox-inline`.
+- Consolidated `.checkbox` and `.radio` into `.form-check` and the various `.form-check-*` classes.
 - Horizontal forms overhauled:
   - Dropped the `.form-horizontal` class requirement.
   - `.form-group` no longer applies styles from the `.row` via mixin, so `.row` is now required for horizontal grid layouts (e.g., `<div class="form-group row">`).