diff --git a/docs/chat.md b/docs/chat.md
index 835f96ae6bf..7e777711513 100644
--- a/docs/chat.md
+++ b/docs/chat.md
@@ -61,6 +61,7 @@ Base endpoint is: `/ocs/v2.php/apps/spreed/api/v1`: since Nextcloud 13
 | `parent`              | array    | **Optional:** See `Parent data` below                                                                                                                                  |
 | `reactions`           | int[]    | **Optional:** An array map with relation between reaction emoji and total count of reactions with this emoji                                                           |
 | `reactionsSelf`       | string[] | **Optional:** When the user reacted this is the list of emojis the user reacted with                                                                                   |
+| `markdown`            | bool     | **Optional:** Whether the message should be rendered as markdown or shown as plain text                                                                                |
 
 #### Parent data
 
diff --git a/lib/Model/Message.php b/lib/Model/Message.php
index 3ef4d6a8204..0be5935dde1 100644
--- a/lib/Model/Message.php
+++ b/lib/Model/Message.php
@@ -181,6 +181,7 @@ public function toArray(string $format): array {
 			'referenceId' => (string) $this->getComment()->getReferenceId(),
 			'reactions' => $reactions,
 			'expirationTimestamp' => $expireDate ? $expireDate->getTimestamp() : 0,
+			'markdown' => $this->getMessageType() === ChatManager::VERB_SYSTEM ? false : true,
 		];
 
 		if ($this->getMessageType() === ChatManager::VERB_MESSAGE_DELETED) {