journal: beef up journal matches considerably

[elogind.git] / man / systemd.journal-fields.xml

diff --git a/man/systemd.journal-fields.xml b/man/systemd.journal-fields.xml
index fd0beb968f66abd9c5ffb3cac3a64550503f99f3..4f664f43e55be45a70092c1c0d6a404fbe634327 100644 (file)
--- a/man/systemd.journal-fields.xml
+++ b/man/systemd.journal-fields.xml
@@ -299,7 +299,12 @@
                 addresses of journal entries are serialized into
                 fields prefixed with double underscores. Note that
                 these aren't proper fields when stored in the journal,
-                but addressing meta data of entries.</para>
+                but addressing meta data of entries. They cannot be
+                written as part of structured log entries via calls
+                such as
+                <citerefentry><refentrytitle>sd_journal_send</refentrytitle><manvolnum>3</manvolnum></citerefentry>. They
+                may also not be used as matches for
+                <citerefentry><refentrytitle>sd_journal_add_match</refentrytitle><manvolnum>3</manvolnum></citerefentry></para>
 
                 <variablelist>
                         <varlistentry>