diff --git a/man/udevadm.xml b/man/udevadm.xml
index 1a9b784776..1a60aef6cf 100644
--- a/man/udevadm.xml
+++ b/man/udevadm.xml
@@ -143,22 +143,25 @@
- Print output as key/value pairs. Values are enclosed in single quotes.
+ Print output as key/value pairs. Values are enclosed in single quotes.
+ This takes effects only when or
+ is specified.
- Add a prefix to the key name of exported values.
+ Add a prefix to the key name of exported values.
+ This implies .
- Print major/minor numbers of the underlying device, where the file
- lives on.
+ Print major/minor numbers of the underlying device, where the file lives on.
+ If this is specified, all positional arguments are ignored.