diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst
index 6c04aea8f4cd83652fc8de70cb104f2348a1d456..b119b8277b3ead734aff49130e26c3b30ee729c5 100644
--- a/Documentation/admin-guide/dynamic-debug-howto.rst
+++ b/Documentation/admin-guide/dynamic-debug-howto.rst
@@ -347,7 +347,7 @@ Examples
 				<debugfs>/dynamic_debug/control
 
   // enable messages in files of which the paths include string "usb"
-  nullarbor:~ # echo -n '*usb* +p' > <debugfs>/dynamic_debug/control
+  nullarbor:~ # echo -n 'file *usb* +p' > <debugfs>/dynamic_debug/control
 
   // enable all messages
   nullarbor:~ # echo -n '+p' > <debugfs>/dynamic_debug/control