diff --git a/index.d.ts b/index.d.ts
index d26755b..06c23e3 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -668,6 +668,8 @@ declare namespace WAWebJS {
     isReadOnly: boolean,
     /** Indicates if the Chat is muted */
     isMuted: boolean,
+    /** Unix timestamp for when the mute expires */
+    muteExpiration: number,
     /** Title of the chat */
     name: string,
     /** Unix timestamp for when the last activity occurred */