diff --git a/src/Nocr.TelegramListener.AppServices/Constants.cs b/src/Nocr.TelegramListener.AppServices/Constants.cs
new file mode 100644
index 0000000..1e78747
--- /dev/null
+++ b/src/Nocr.TelegramListener.AppServices/Constants.cs
@@ -0,0 +1,9 @@
+namespace Nocr.TelegramListener.AppServices;
+
+public static class Constants
+{
+    public static class RoutingKeys
+    {
+        public const string Subscriptions = "nocr.text.matcher.subscriptions";
+    }
+}
\ No newline at end of file
diff --git a/src/Nocr.TelegramListener.Host/Infrastructure/Startup.cs b/src/Nocr.TelegramListener.Host/Infrastructure/Startup.cs
index 5765aa4..f033ff3 100644
--- a/src/Nocr.TelegramListener.Host/Infrastructure/Startup.cs
+++ b/src/Nocr.TelegramListener.Host/Infrastructure/Startup.cs
@@ -50,6 +50,6 @@ public class Startup
     {
         var bus = app.ApplicationServices.GetRequiredService<IBus>();
         // TODO:
-        bus.Advanced.Topics.Subscribe("nocr.text.matcher.matches").GetAwaiter().GetResult();
+        bus.Advanced.Topics.Subscribe(Constants.RoutingKeys.Subscriptions).GetAwaiter().GetResult();
     }
 }
\ No newline at end of file