diff --git a/useful_commands b/useful_commands
index da43ac7..c4308ca 100644
--- a/useful_commands
+++ b/useful_commands
@@ -252,3 +252,5 @@ emacs -batch -l dunnet
 # BINARY CLOCK!
 watch -n 1 'echo "obase=2;`date +%s`" | bc'
 
+# dbus introspection
+busctl -j --user introspect org.freedesktop.Notifications "/fr/emersion/Mako"