diff --git a/index.d.ts b/index.d.ts
index dfeb93f2f..10920e589 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -273,6 +273,13 @@ declare namespace Eris {
       INTEGRATION_UPDATE: 81;
       INTEGRATION_DELETE: 82;
     };
+    MessageFlags: {
+      CROSSPOSTED: 0;
+      IS_CROSSPOST: 2;
+      SUPPRESS_EMBEDS: 4;
+      SOURCE_MESSAGE_DELETED: 8;
+      URGENT: 16;
+    };
     MessageTypes: {
       DEFAULT: 0;
       RECIPIENT_ADD: 1;
@@ -1615,6 +1622,7 @@ declare namespace Eris {
     defaultAvatarURL: string;
     avatarURL: string;
     staticAvatarURL: string;
+    system: boolean;
     constructor(data: BaseData, client: Client);
     dynamicAvatarURL(format?: string, size?: number): string;
     getDMChannel(): Promise<PrivateChannel>;
diff --git a/lib/Constants.js b/lib/Constants.js
index a480ed2ca..16417fb2b 100644
--- a/lib/Constants.js
+++ b/lib/Constants.js
@@ -170,7 +170,9 @@ module.exports.AuditLogActions = {
 module.exports.MessageFlags = {
     CROSSPOSTED: 1 << 0,
     IS_CROSSPOST: 1 << 1,
-    SUPPRESS_EMBEDS: 1 << 2
+    SUPPRESS_EMBEDS: 1 << 2,
+    SOURCE_MESSAGE_DELETED: 1 << 3,
+    URGENT: 1 << 4
 };
 
 module.exports.MessageTypes = {
diff --git a/lib/structures/User.js b/lib/structures/User.js
index a6042baff..40450694b 100644
--- a/lib/structures/User.js
+++ b/lib/structures/User.js
@@ -18,6 +18,7 @@ const {ImageSizeBoundaries, ImageFormats} = require("../Constants");
 * @prop {String} defaultAvatarURL The URL of the user's default avatar
 * @prop {String} avatarURL The URL of the user's avatar which can be either a JPG or GIF
 * @prop {String} staticAvatarURL The URL of the user's avatar (always a JPG)
+* @prop {Boolean} system Whether the user is an official Discord system user (e.g. urgent messages)
 */
 class User extends Base {
     constructor(data, client) {
@@ -27,6 +28,7 @@ class User extends Base {
         }
         this._client = client;
         this.bot = !!data.bot;
+        this.system = !!data.system;
         this.update(data);
     }