diff --git a/CHANGELOG.md b/CHANGELOG.md
index db5afdce..cf8e0f71 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- `@marp-team/marpit/plugin` for creating Marpit plugin ([#214](https://github.com/marp-team/marpit/issues/214), [#217](https://github.com/marp-team/marpit/pull/217))
+
 ### Changed
 
 - Upgrade dependent packages to the latest version ([#211](https://github.com/marp-team/marpit/pull/211), [#213](https://github.com/marp-team/marpit/pull/213), [#216](https://github.com/marp-team/marpit/pull/216))
@@ -11,6 +15,7 @@
 ### Removed
 
 - CI test against EOL Node 8 ([#216](https://github.com/marp-team/marpit/pull/216))
+- `Marpit` prefixes in the name of some type definitions for TypeScript ([#217](https://github.com/marp-team/marpit/pull/217))
 
 ## v1.4.2 - 2019-11-06
 
diff --git a/api.md b/api.md
index a5bacf64..ab6a78f7 100644
--- a/api.md
+++ b/api.md
@@ -24,7 +24,9 @@ import { Element, Marpit, Theme, ThemeSet } from '@marp-team/marpit'
 
 ### Modules _(for internal)_
 
-**Modules** section is documented about internal modules, that is includes plugins of markdown-it and PostCSS. Basically _Marpit user should not use internal module directly._
+**Modules** section is documented about internal modules, that is includes plugins of markdown-it and PostCSS.
+
+Basically _Marpit user should not use internal module directly._
 
 ---