diff --git a/docs/migration.md b/docs/migration.md
index 5e7236f8a9..ea7c67f65b 100644
--- a/docs/migration.md
+++ b/docs/migration.md
@@ -105,6 +105,7 @@ New to Bootstrap 4 is the Reboot, a new stylesheet that builds on Normalize with
 ### Button group
 
 - Dropped the `.btn-group-xs` class entirely given removal of `.btn-xs`.
+- Removed justified button groups as they were only available for `<a>` elements and not `<button>` elements.
 
 ### Dropdowns