man: Correct flag description of systemd-cat

It is not true that "no string" is written to journal; the binary
name is used when run via `systemd-cat command`, or `cat` is used
when run via `command | systemd-cat`.

diff --git a/man/systemd-cat.xml b/man/systemd-cat.xml
index 280492dea592bd7d349c66e6c22224b81a51311d..b60984b8a083873c868c360af86898a7e60aefae 100644 (file)
--- a/man/systemd-cat.xml
+++ b/man/systemd-cat.xml
@@ -63,7 +63,10 @@
 
         <listitem><para>Specify a short string that is used to
         identify the logging tool. If not specified, no identification
-        string is written to the journal.</para></listitem>
+        string is set for the journal entry, and the executable name
+        (or <literal>cat</literal> if the input is read from a pipe)
+        will be used to describe the log source instead.
+        </para></listitem>
       </varlistentry>
 
       <varlistentry>