diff --git a/scss/_forms.scss b/scss/_forms.scss
index df28863389..3138c7af0c 100644
--- a/scss/_forms.scss
+++ b/scss/_forms.scss
@@ -89,6 +89,8 @@
 // text within the input to become vertically misaligned. As a workaround, we
 // set a pixel line-height that matches the given height of the input, but only
 // for Safari. See https://bugs.webkit.org/show_bug.cgi?id=139848
+//
+// Note that as of 8.3, iOS doesn't support `datetime` or `week`.
 
 @media screen and (-webkit-min-device-pixel-ratio: 0) {
   input[type="date"],