diff --git a/CHANGELOG.md b/CHANGELOG.md
index bc6cd734..f7c5903f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 ## 8.3.0 (Not Released Yet)
 
+### New features
+
+* Slow mode (#192):
+  * new option in room configuration to set the slow mode delay (new prosody module mod_muc_slow_mode).
+
 ### Minor changes and fixes
 
 * Fix ConverseJS build: translations were missing, and only english was available.
diff --git a/prosody-modules/mod_muc_slow_mode/README.md b/prosody-modules/mod_muc_slow_mode/README.md
new file mode 100644
index 00000000..7705824b
--- /dev/null
+++ b/prosody-modules/mod_muc_slow_mode/README.md
@@ -0,0 +1,7 @@
+# mod_muc_slow_mode
+
+This module is a custom module that allows slow mode for MUC rooms.
+
+This module is part of peertube-plugin-livechat, and is under the same LICENSE.
+
+There will probably be a XEP proposal for this module behaviour. When done, this module will be published in the prosody-modules repository.
diff --git a/prosody-modules/mod_muc_slow_mode/mod_muc_slow_mode.lua b/prosody-modules/mod_muc_slow_mode/mod_muc_slow_mode.lua
new file mode 100644
index 00000000..7471a510
--- /dev/null
+++ b/prosody-modules/mod_muc_slow_mode/mod_muc_slow_mode.lua
@@ -0,0 +1,62 @@
+-- mod_muc_slow_mode
+--
+-- Copyright (C) 2024 John Livingston
+--
+-- This file is AGPL-v3 licensed.
+-- Please see the Peertube livechat plugin copyright information.
+-- https://livingston.frama.io/peertube-plugin-livechat/credits/
+--
+-- Implements: XEP-????: MUC Slow Mode (XEP to come).
+--
+-- Imports
+
+-- Plugin dependencies
+local mod_muc = module:depends "muc";
+
+-- Getter/Setter
+local function get_slow_mode_delay(room)
+	return room._data.slow_mode_delay or 0;
+end
+
+local function set_slow_mode_delay(room, delay)
+  if delay then
+		delay = assert(tonumber(delay), "Slow mode delay is not a valid number");
+	end
+  if delay and delay < 0 then
+    delay = 0;
+  end
+	room._data.slow_mode_delay = delay;
+	return true;
+end
+
+-- Discovering support
+local function add_disco_form(event)
+  table.insert(event.room, {
+    name = "muc#roomconfig_slow_mode_delay";
+    value = "";
+  });
+  event.formdata["muc#roomconfig_slow_mode_delay"] = get_slow_mode_delay(event.room);
+end
+
+module:hook("mub-disco#info", add_disco_form);
+
+-- Config form declaration
+local function add_form_option(event)
+  table.insert(event.form, {
+    name = "muc#roomconfig_slow_mode_delay";
+    type = "text-single";
+		datatype = "xs:integer";
+    label = "Slow Mode (0=disabled, any positive integer= minimal delay in seconds between two messages from the same user)";
+    desc = "Minimal delay, in seconds, between two messages for the same user in the room. If value is set to 0, the slow mode is not active.";
+    value = get_slow_mode_delay(event.room);
+  });
+end
+
+module:hook("muc-config-submitted/muc#roomconfig_slow_mode_delay", function(event)
+	if set_slow_mode_delay(event.room, event.value) then
+    -- status 104 = configuration change: Inform occupants that a non-privacy-related room configuration change has occurred
+		event.status_codes["104"] = true;
+	end
+end);
+
+module:hook("muc-config-form", add_form_option, 100-4);
diff --git a/server/lib/prosody/config/content.ts b/server/lib/prosody/config/content.ts
index 5acc5ecf..60a134ba 100644
--- a/server/lib/prosody/config/content.ts
+++ b/server/lib/prosody/config/content.ts
@@ -205,6 +205,8 @@ class ProsodyConfigContent {
     this.muc.set('muc_room_default_public_jids', false)
     this.muc.set('muc_room_default_change_subject', false)
     this.muc.set('muc_room_default_history_length', 20)
+
+    this.muc.add('modules_enabled', 'muc_slow_mode')
   }
 
   useAnonymous (autoBanIP: boolean): void {