diff --git a/docs/components/button-group.md b/docs/components/button-group.md
index 5f78863033..c14d3d63ab 100644
--- a/docs/components/button-group.md
+++ b/docs/components/button-group.md
@@ -68,19 +68,12 @@ Instead of applying button sizing classes to every button in a group, just add `
-
-
diff --git a/docs/migration.md b/docs/migration.md
index bd8ee7529b..d1c58c94f3 100644
--- a/docs/migration.md
+++ b/docs/migration.md
@@ -77,6 +77,14 @@ New to Bootstrap 4 is the Reboot, a new stylesheet that builds on Normalize with
- Added a new `~480px` grid breakpoint, meaning there are now five total tiers.
+### Buttons
+
+- Dropped the `.btn-xs` class entirely.
+
+### Button group
+
+- Dropped the `.btn-group-xs` class entirely.
+
### Navs
- Dropped nearly all `>` selectors for simpler styling via un-nested classes.