diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1b45dd1..17d56f2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,8 @@
 
   * Moved `RelativeTimeFormat` to a separate `relative-time-format` package.
 
+  * (breaking change) Removed `.locale()` static function. Use `.addLocale()` instead.
+
   * (breaking change) `flavour` property renamed in non-single-word cases: underscores (`_`) got replaced with dashes (`-`). Examples: `short_convenient` -> `short-convenient`, `long_convenient` -> `long-convenient`, `short_time` -> `short-time`, `long_time` -> `long-time`. The relevant keys in locale `index.js` files got renamed the same way.
 
   * (breaking change) `RelativeTimeFormat` is no longer exported from this library.
diff --git a/MIGRATION.md b/MIGRATION.md
index 3b5e2d0..66f400d 100644
--- a/MIGRATION.md
+++ b/MIGRATION.md
@@ -1,5 +1,9 @@
 # Migration from version `1.x`
 
+### `.locale()` function removed.
+
+If there're any `.locale()` static function calls then replace them with `.addLocale()`.
+
 ### `flavour`s that got renamed.
 
 If any custom styles were defined replace the following `flavour`s in their definition: