diff --git a/docs/capabilities.md b/docs/capabilities.md
index 2fb160374f2..f953abe008a 100644
--- a/docs/capabilities.md
+++ b/docs/capabilities.md
@@ -125,3 +125,4 @@
 ## 17.1
 * `remind-me-later` - Support for "Remind me later" for chat messages exists
 * `bots-v1` - Support of the first version for Bots and Webhooks is available
+* `markdown-messages` - Chat messages support markdown and are rendered automatically
diff --git a/lib/Capabilities.php b/lib/Capabilities.php
index fb852a2e386..54e263aff24 100644
--- a/lib/Capabilities.php
+++ b/lib/Capabilities.php
@@ -121,6 +121,7 @@ public function getCapabilities(): array {
 				'typing-privacy',
 				'remind-me-later',
 				'bots-v1',
+				'markdown-messages',
 			],
 			'config' => [
 				'attachments' => [
diff --git a/tests/php/CapabilitiesTest.php b/tests/php/CapabilitiesTest.php
index e556cf3217a..ccb45712135 100644
--- a/tests/php/CapabilitiesTest.php
+++ b/tests/php/CapabilitiesTest.php
@@ -139,6 +139,7 @@ public function setUp(): void {
 			'typing-privacy',
 			'remind-me-later',
 			'bots-v1',
+			'markdown-messages',
 			'message-expiration',
 			'reactions',
 		];