diff --git a/content/client-server-api/modules/read_markers.md b/content/client-server-api/modules/read_markers.md
index 55e73dd5..830a441f 100644
--- a/content/client-server-api/modules/read_markers.md
+++ b/content/client-server-api/modules/read_markers.md
@@ -57,6 +57,8 @@ applicable filters are also satisfied.
 
 #### Unread markers
 
+{{% added-in v="1.12" %}}
+
 Clients may use "unread markers" to allow users to label rooms for later
 attention irrespective of [read receipts](#receipts) or
 [fully read markers](#fully-read-markers).