diff --git a/vlogger.8 b/vlogger.8
index 24a45c82..8f0a60ca 100644
--- a/vlogger.8
+++ b/vlogger.8
@@ -115,7 +115,20 @@ Defines the
 .Pa ident
 which is used as prefix for each log message or passed as first argument to
 .Pa /etc/vlogger .
-The default is the
+If not given, the default is an empty string when
+.Pa /etc/vlogger
+is used.
+When
+.Xr syslog 3
+is used directly, the default is the result of
+.Xr getlogin 3 ,
+which on
+.Tn glibc
+always returns
+.Dv NULL
+(no tag) and on
+.Tn musl
+returns the value of the
 .Ev LOGNAME
 environment variable.
 .It Ar message