diff --git a/tmux.1 b/tmux.1
index 1e641602e..05873a8a1 100644
--- a/tmux.1
+++ b/tmux.1
@@ -5076,6 +5076,10 @@ Ignore function keys from
 and use the
 .Nm
 internal set only.
+.It kitty
+Supports Kitty graphics using Unicode placeholders.
+The terminal must support the Kitty Unicode placeholder extension, not only
+the basic Kitty graphics protocol.
 .It margins
 Supports DECSLRM margins.
 .It mouse
diff --git a/tty-features.c b/tty-features.c
index 86fd223ac..5cab80231 100644
--- a/tty-features.c
+++ b/tty-features.c
@@ -360,7 +360,7 @@ static const struct tty_feature tty_feature_sixel = {
 	TERM_SIXEL
 };
 
-/* Terminal has Kitty graphics protocol capability. */
+/* Terminal has Kitty graphics protocol Unicode placeholder capability. */
 static const char *const tty_feature_kitty_capabilities[] = {
 	"Kty",
 	TTY_FEATURE_SYNC,
@@ -625,6 +625,7 @@ tty_default_features(struct client *c, const char *name, u_int version)
 			      "extkeys,"
 			      "focus,"
 		  	      "hyperlinks,"
+			      "sixel,"
 			      "usstyle"
 		},
 		{ .name = "ghostty",