mention media query changes

diff --git a/docs/migration.md b/docs/migration.md
index 2d1e54ec185375de96105c05d5c9daf7c1ba8dab..acab25c020d2f3be160135eb064254cebe933726 100644 (file)
--- a/docs/migration.md
+++ b/docs/migration.md
@@ -35,6 +35,7 @@ Here are the big ticket items you'll want to be aware of when moving from v3 to
 - Added a new `sm` grid tier below `768px` for more granular control. We now have `xs`, `sm`, `md`, `lg`, and `xl`. This also means every tier has been bumped up one level (so `.col-md-6` in v3 is now `.col-lg-6` in v4).
 - Changed grid system media query breakpoints and container widths to account for new grid tier and ensure columns are evenly divisible by `12` at their max width.
 - Grid breakpoints and container widths are now handled via Sass maps instead of a handful of separate variables. These replace the `@screen-*` variables entirely and allow you to fully customize the grid tiers.
+- Media queries have also changed. Instead of repeating our media query declarations with the same value each time, we now have `@include media-breakpoint-up/down/only`. Now, instead of writing `@media (min-width: @screen-sm-min) { ... }`, you can write `@include media-breakpoint-up(sm) { ... }`.
 
 ### Components