diff --git a/src/ScratchSession.ts b/src/ScratchSession.ts
index cea4cef..e0039b1 100644
--- a/src/ScratchSession.ts
+++ b/src/ScratchSession.ts
@@ -204,6 +204,11 @@ class ScratchSession {
     }[];
   }
 
+  /**
+   * Get messages
+   * @param limit The limit of messages to get
+   * @param offset The offset of messages
+   */
   async getMessages(limit: number = 40, offset: number = 0) {
     const request = await fetch(`https://api.scratch.mit.edu/users/${this.username}/messages?limit=${limit}&offset=${offset}`, {
       headers: {
@@ -215,7 +220,11 @@ class ScratchSession {
     if(!request.ok) throw Error(`Request failed with status ${request.status}`);
     return (await request.json()) as Message[];
   }
-
+  
+  /**
+   * Get the message count
+   * @returns The number of messages
+   */
   async getMessageCount() {
     const request = await fetch(`https://api.scratch.mit.edu/users/${this.username}/messages/count`);
     if(!request.ok) throw Error(`Request failed with status ${request.status}`);
diff --git a/src/classes/Project.ts b/src/classes/Project.ts
index 880879e..1709fc5 100644
--- a/src/classes/Project.ts
+++ b/src/classes/Project.ts
@@ -289,6 +289,10 @@ class Project {
     }
   }
 
+  /**
+   * Set the thumbnail of the project
+   * @param buffer The buffer of the thumbnail image file
+   */
   async setThumbnail(buffer: Buffer) {
     const request = await fetch(
       `https://scratch.mit.edu/internalapi/project/thumbnail/${this.id}/set/`,
diff --git a/src/classes/Studio.ts b/src/classes/Studio.ts
index f2b3014..0349815 100644
--- a/src/classes/Studio.ts
+++ b/src/classes/Studio.ts
@@ -51,6 +51,9 @@ class Studio {
     this.session = session;
   }
 
+  /**
+   * Get the API data of the studio
+   */
   async getAPIData() {
     const response = await fetch(
       `https://api.scratch.mit.edu/studios/${this.id}/`,
@@ -63,6 +66,9 @@ class Studio {
     return (await response.json()) as StudioAPIResponse;
   }
 
+  /**
+   * Follow the studio
+   */
   async follow() {
     const request = await fetch(
       `https://scratch.mit.edu/site-api/users/bookmarkers/${this.id}/add/?usernames=${this.session.sessionJSON.user.username}`,
@@ -84,6 +90,9 @@ class Studio {
       throw Error(`Request failed with status ${request.status}`);
   }
 
+  /**
+   * Unfollow the studio
+   */
   async unfollow() {
     const request = await fetch(
       `https://scratch.mit.edu/site-api/users/bookmarkers/${this.id}/remove/?usernames=${this.session.sessionJSON.user.username}`,