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-rw-r--r--docs/migration.md6
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diff --git a/docs/migration.md b/docs/migration.md
index dd3738c7b..c5416b663 100644
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@@ -51,4 +51,10 @@ The following components have been removed in v4.0.0.
| Wells | | Cards |
| Justified navs | | |
+The following deprecated Less/SCSS variables have been removed in v4.0.0:
+* `@screen-phone`, `@screen-tablet`, `@screen-desktop`, `@screen-lg-desktop`. Use the more abstract `$screen-{xs,sm,md,lg,xl}-*` variables instead.
+* `@screen-sm`, `@screen-md`, `@screen-lg`. Use the more clearly named `$screen-{xs,sm,md,lg,xl}-min` variables instead.
+* `@screen-xs`, `@screen-xs-min`. The extra small breakpoint has no lower bound, so these variables were logically absurd. Reformulate your expression in terms of `$screen-xs-max` instead.
+* `@grid-float-breakpoint`
+
## Additional notes