diff --git a/CHANGELOG.md b/CHANGELOG.md
index d1b02bff..709935dd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,26 @@
 # Changelog
 
+## 5.6.0 (Not Released Yet)
+
+### Important notes
+
+Following modes are deprecated and will be soon removed (in version 6.0.0, scheduled for may or june 2022):
+
+* Connect to an existing XMPP server with ConverseJS
+* Use an external web chat tool
+
+The only remaining mode will be the recommanded one: «Prosody server controlled by Peertube».
+
+If you need one of the 2 deprecated mode, please open an issue ASAP to explain your use case.
+
+These modes were here for historical reasons (backward compatibility, etc.).
+But now there are hard to maintain, and impossible to document (adding a lot of confusion).
+Moreover, they don't seem to be used much.
+
+### Changes
+
+* Adding a deprecation warning in the settings page when using one of the 2 deprecated mode.
+
 ## 5.5.0
 
 ### Features
diff --git a/server/lib/settings.ts b/server/lib/settings.ts
index 90f7c1d1..8e6593cb 100644
--- a/server/lib/settings.ts
+++ b/server/lib/settings.ts
@@ -71,7 +71,14 @@ Please read the <a
     type: 'html',
     label: 'Connect to an existing XMPP server with ConverseJS',
     descriptionHTML:
-`With this mode, you can connect to an existing XMPP server, that allow anonymous authentication and room creation.
+`<div class="peertube-plugin-livechat-warning"><b>
+  This mode is deprecated and will be removed in version 6.0.0.
+  More information in the
+  <a href="https://github.com/JohnXLivingston/peertube-plugin-livechat/blob/main/CHANGELOG.md#551" target="_blank">
+    CHANGELOG
+  </a>.
+</b></div>
+With this mode, you can connect to an existing XMPP server, that allow anonymous authentication and room creation.
 Please read the
 <a
   href="https://github.com/JohnXLivingston/peertube-plugin-livechat/blob/main/documentation/conversejs.md"
@@ -84,7 +91,14 @@ Please read the
     type: 'html',
     label: 'Use an external webchat',
     descriptionHTML:
-`With this mode, you can use any external web chat that can be included in an iframe.
+`<div class="peertube-plugin-livechat-warning"><b>
+This mode is deprecated and will be removed in version 6.0.0.
+More information in the
+<a href="https://github.com/JohnXLivingston/peertube-plugin-livechat/blob/main/CHANGELOG.md#551" target="_blank">
+  CHANGELOG
+</a>.
+</b></div>
+With this mode, you can use any external web chat that can be included in an iframe.
 Please read the
 <a
   href="https://github.com/JohnXLivingston/peertube-plugin-livechat/blob/main/documentation/external.md"