diff --git a/src/util/SystemChannelFlags.js b/src/util/SystemChannelFlags.js
index b7a3f172f..c4d16a6de 100644
--- a/src/util/SystemChannelFlags.js
+++ b/src/util/SystemChannelFlags.js
@@ -34,13 +34,15 @@ class SystemChannelFlags extends BitField {}
 
 /**
  * Numeric system channel flags. All available properties:
- * * `WELCOME_MESSAGE_DISABLED`
- * * `BOOST_MESSAGE_DISABLED`
+ * * `SUPPRESS_JOIN_NOTIFICATIONS` (Suppress member join notifications)
+ * * `SUPPRESS_PREMIUM_SUBSCRIPTIONS` (Suppress server boost notifications)
+ * * `SUPPRESS_GUILD_REMINDER_NOTIFICATIONS` (Suppress server setup tips)
  * @type {Object}
  */
 SystemChannelFlags.FLAGS = {
-  WELCOME_MESSAGE_DISABLED: 1 << 0,
-  BOOST_MESSAGE_DISABLED: 1 << 1,
+  SUPPRESS_JOIN_NOTIFICATIONS: 1 << 0,
+  SUPPRESS_PREMIUM_SUBSCRIPTIONS: 1 << 1,
+  SUPPRESS_GUILD_REMINDER_NOTIFICATIONS: 1 << 2,
 };
 
 module.exports = SystemChannelFlags;
diff --git a/typings/index.d.ts b/typings/index.d.ts
index 8075e77bf..1da3ff222 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -3369,7 +3369,10 @@ declare module 'discord.js' {
 
   type StringResolvable = string | string[] | any;
 
-  type SystemChannelFlagsString = 'WELCOME_MESSAGE_DISABLED' | 'BOOST_MESSAGE_DISABLED';
+  type SystemChannelFlagsString =
+    | 'SUPPRESS_JOIN_NOTIFICATIONS'
+    | 'SUPPRESS_PREMIUM_SUBSCRIPTIONS'
+    | 'SUPPRESS_GUILD_REMINDER_NOTIFICATIONS';
 
   type SystemChannelFlagsResolvable = BitFieldResolvable<SystemChannelFlagsString, number>;