diff --git a/tty-features.c b/tty-features.c
index 614c63f62..62ec327b8 100644
--- a/tty-features.c
+++ b/tty-features.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: tty-features.c,v 1.40 2026/07/01 06:17:58 nicm Exp $ */
+/* $OpenBSD: tty-features.c,v 1.41 2026/08/17 07:52:16 nicm Exp $ */
 
 /*
  * Copyright (c) 2020 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -586,6 +586,18 @@ tty_default_features(int *feat, const char *name, u_int version)
 			      "usstyle,"
 			      "progressbar"
 		},
+		{ .name = "Rio",
+		  .features = TTY_FEATURES_BASE_MODERN_XTERM ","
+			      "ccolour,"
+			      "cstyle,"
+			      "focus,"
+			      "overline,"
+			      "hyperlinks,"
+			      "osc7,"
+			      "sync,"
+			      "usstyle,"
+			      "progressbar"
+		},
 		{ .name = "XTerm",
 		  /*
 		   * xterm also supports DECSLRM and DECFRA, but they can be
diff --git a/tty-keys.c b/tty-keys.c
index 2d4454b6c..7ece78639 100644
--- a/tty-keys.c
+++ b/tty-keys.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: tty-keys.c,v 1.211 2026/07/21 07:12:49 nicm Exp $ */
+/* $OpenBSD: tty-keys.c,v 1.212 2026/08/17 07:52:16 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -1667,6 +1667,8 @@ tty_keys_extended_device_attributes(struct tty *tty, const char *buf,
 		tty_default_features(features, "WezTerm", 0);
 	else if (strncmp(tmp, "ghostty ", 8) == 0)
 		tty_default_features(features, "ghostty", 0);
+	else if (strncmp(tmp, "Rio ", 4) == 0)
+		tty_default_features(features, "Rio", 0);
 	log_debug("%s: received extended DA %.*s", c->name, (int)*size, buf);
 
 	free(c->term_type);