diff --git a/src/interfaces/api/person.ts b/src/interfaces/api/person.ts
index ffc4e55..b36027c 100644
--- a/src/interfaces/api/person.ts
+++ b/src/interfaces/api/person.ts
@@ -86,7 +86,7 @@ export interface SaveUserSettings {
    * Post listing types are `All, Subscribed, Community`
    */
   default_listing_type?: number;
-  lang?: string;
+  interface_language?: string;
   avatar?: string;
   banner?: string;
   display_name?: string;
@@ -100,6 +100,7 @@ export interface SaveUserSettings {
   show_bot_accounts?: boolean;
   show_read_posts?: boolean;
   show_new_post_notifs?: boolean;
+  discussion_languages: string[];
   auth: string;
 }
 
diff --git a/src/interfaces/api/post.ts b/src/interfaces/api/post.ts
index 2012dd1..5a26567 100644
--- a/src/interfaces/api/post.ts
+++ b/src/interfaces/api/post.ts
@@ -12,6 +12,7 @@ export interface CreatePost {
   url?: string;
   body?: string;
   nsfw?: boolean;
+  language?: string;
   community_id: number;
   auth: string;
   honeypot?: string;
diff --git a/src/interfaces/source.ts b/src/interfaces/source.ts
index 8d01aa2..4c0037e 100644
--- a/src/interfaces/source.ts
+++ b/src/interfaces/source.ts
@@ -109,6 +109,7 @@ export interface Post {
   thumbnail_url?: string;
   ap_id: string;
   local: boolean;
+  language: string;
 }
 
 export interface PasswordResetRequest {