diff --git a/modules/primer-buttons/lib/button-group.scss b/modules/primer-buttons/lib/button-group.scss
index cc48308fdf..82e96f6fec 100644
--- a/modules/primer-buttons/lib/button-group.scss
+++ b/modules/primer-buttons/lib/button-group.scss
@@ -2,6 +2,8 @@
 //
 // A button group is a series of buttons laid out next to each other, all part
 // of one visual button, but separated by rules to be separate.
+@warn ".BtnGroup-form will be deprecated in version 11. Use .BtnGroup-parent instead.";
+
 .BtnGroup {
   display: inline-block;
   vertical-align: middle;