diff --git a/pages/android/cmd.md b/pages/android/cmd.md
index deff44d8c2..fc18cf7c35 100644
--- a/pages/android/cmd.md
+++ b/pages/android/cmd.md
@@ -1,6 +1,7 @@
 # cmd
 
 > Android service manager.
+> More information: <https://cs.android.com/android/platform/superproject/+/master:frameworks/native/cmds/cmd/>.
 
 - List every running service: