diff --git a/server.go b/server.go
index ec92464..0d94ebb 100644
--- a/server.go
+++ b/server.go
@@ -156,10 +156,14 @@ This capsule is running MastoGem, a free (as in free speech, not as in free beer
 
 Feel free to contribute, send feedback or share ideas.
 
+# Mastodon instance
+
+This capsule use %s Mastodon instance.
+
 # AGPLv3 License
 
 => http://www.gnu.org/licenses/agpl-3.0.txt AGPLv3 License text`
-		_, err = fmt.Fprintf(conn, "20 text/gemini\r\n" + page)
+		_, err = fmt.Fprintf(conn, "20 text/gemini\r\n" + page, baseURL)
 		if err != nil {
 			log.Println("send: %s", err)
 			return