diff --git a/packages/mdc-floating-label/mdc-floating-label.scss b/packages/mdc-floating-label/mdc-floating-label.scss
index 7dfd57ba4bb..b25bd0ce9a1 100644
--- a/packages/mdc-floating-label/mdc-floating-label.scss
+++ b/packages/mdc-floating-label/mdc-floating-label.scss
@@ -42,6 +42,7 @@
     transition:
       transform $mdc-floating-label-transition-duration $mdc-animation-standard-curve-timing-function,
       color $mdc-floating-label-transition-duration $mdc-animation-standard-curve-timing-function;
+    /* @alternate */
     line-height: 1.15rem;
     text-align: left;
     text-overflow: ellipsis;