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-rw-r--r--man/systemd.journal-fields.xml7
1 files changed, 6 insertions, 1 deletions
diff --git a/man/systemd.journal-fields.xml b/man/systemd.journal-fields.xml
index fd0beb968f..4f664f43e5 100644
--- 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>