diff --git a/etc/mfm-js.api.md b/etc/mfm-js.api.md
index 6792d39..6aef754 100644
--- a/etc/mfm-js.api.md
+++ b/etc/mfm-js.api.md
@@ -190,7 +190,7 @@ export type MfmSearch = {
 };
 
 // @public (undocumented)
-export type MfmSimpleNode = MfmUnicodeEmoji | MfmEmojiCode | MfmText;
+export type MfmSimpleNode = MfmUnicodeEmoji | MfmEmojiCode | MfmText | MfmPlain;
 
 // @public (undocumented)
 export type MfmSmall = {