diff --git a/src/client/ClientDataResolver.js b/src/client/ClientDataResolver.js
index 60870d8c0..9ab4c1e5d 100644
--- a/src/client/ClientDataResolver.js
+++ b/src/client/ClientDataResolver.js
@@ -155,6 +155,7 @@ class ClientDataResolver {
    *   "ADMINISTRATOR",
    *   "MANAGE_CHANNELS",
    *   "MANAGE_GUILD",
+   *   "ADD_REACTIONS", // add reactions to messages
    *   "READ_MESSAGES",
    *   "SEND_MESSAGES",
    *   "SEND_TTS_MESSAGES",
diff --git a/src/util/Constants.js b/src/util/Constants.js
index 4d2070fa1..05f999789 100644
--- a/src/util/Constants.js
+++ b/src/util/Constants.js
@@ -265,6 +265,7 @@ const PermissionFlags = exports.PermissionFlags = {
   ADMINISTRATOR: 1 << 3,
   MANAGE_CHANNELS: 1 << 4,
   MANAGE_GUILD: 1 << 5,
+  ADD_REACTIONS: 1 << 6,
 
   READ_MESSAGES: 1 << 10,
   SEND_MESSAGES: 1 << 11,