README: mention -m

diff --git a/README b/README
index 3fb72eaed1847325145e656ef4beedcd32900d4a..8df210dc9bb2f7161c94a1d52d1669e04d8c1d04 100644 (file)
--- a/README
+++ b/README
@@ -70,6 +70,10 @@ i.e the user logs out:
     ./src/wall-notify -X cat
 
 
+By default only messages from root are displayed. To allow messages from other
+users (which includes `rwalld` in most setups) the option '-m' must be used.
+
+
 BUGS
 ----