diff --git a/README.md b/README.md
index 4d7d6204..93262260 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@
 
 * 🔒 Full account management.
   * Add multiple accounts and easily switch between them.
+  * Microsoft (OAuth 2.0) + Mojang (Yggdrasil) authentication fully supported.
   * Credentials are never stored and transmitted directly to Mojang.
 * 📂 Efficient asset management.
   * Receive client updates as soon as we release them.
@@ -180,13 +181,15 @@ Note that you **cannot** open the DevTools window while using this debug configu
 
 Please give credit to the original author and provide a link to the original source. This is free software, please do at least this much.
 
+For instructions on setting up Microsoft Authentication, see https://github.com/dscalzi/HeliosLauncher/blob/feature/ms-auth/docs/MicrosoftAuth.md.
+
 ---
 
 ## Resources
 
 * [Wiki][wiki]
 * [Nebula (Create Distribution.json)][nebula]
-* [v2 Rewrite Branch (WIP)][v2branch]
+* [v2 Rewrite Branch (Inactive)][v2branch]
 
 The best way to contact the developers is on Discord.
 
diff --git a/app/assets/js/ipcconstants.js b/app/assets/js/ipcconstants.js
index dcd4d946..536e948b 100644
--- a/app/assets/js/ipcconstants.js
+++ b/app/assets/js/ipcconstants.js
@@ -1,14 +1,23 @@
-exports.AZURE_CLIENT_ID = 'FILL-IN'
+// NOTE FOR THIRD-PARTY
+// REPLACE THIS CLIENT ID WITH YOUR APPLICATION ID.
+// SEE https://github.com/dscalzi/HeliosLauncher/blob/feature/ms-auth/docs/MicrosoftAuth.md
+exports.AZURE_CLIENT_ID = '1ce6e35a-126f-48fd-97fb-54d143ac6d45'
+// SEE NOTE ABOVE.
+
+
+// Opcodes
 exports.MSFT_OPCODE = {
     OPEN_LOGIN: 'MSFT_AUTH_OPEN_LOGIN',
     OPEN_LOGOUT: 'MSFT_AUTH_OPEN_LOGOUT',
     REPLY_LOGIN: 'MSFT_AUTH_REPLY_LOGIN',
     REPLY_LOGOUT: 'MSFT_AUTH_REPLY_LOGOUT'
 }
+// Reply types for REPLY opcode.
 exports.MSFT_REPLY_TYPE = {
     SUCCESS: 'MSFT_AUTH_REPLY_SUCCESS',
     ERROR: 'MSFT_AUTH_REPLY_ERROR'
 }
+// Error types for ERROR reply.
 exports.MSFT_ERROR = {
     ALREADY_OPEN: 'MSFT_AUTH_ERR_ALREADY_OPEN',
     NOT_FINISHED: 'MSFT_AUTH_ERR_NOT_FINISHED'