diff --git a/modules/logging-release-notes-5-9-15.adoc b/modules/logging-release-notes-5-9-15.adoc
index 025606c7aef3..70735e7a6fea 100644
--- a/modules/logging-release-notes-5-9-15.adoc
+++ b/modules/logging-release-notes-5-9-15.adoc
@@ -22,4 +22,9 @@ This release includes link:https://access.redhat.com/errata/RHBA-2025:8775[RHBA-
 [NOTE]
 ====
 For detailed information on Red{nbsp}Hat security ratings, review link:https://access.redhat.com/security/updates/classification/#low[Severity ratings].
-====
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+====
+
+[id="known-issues-5-9-15_{context}"]
+== Known issues
+
+When forwarding logs to a syslog output, the produced message format is inconsistent between Fluentd and Vector log collectors. Vector messages are within quotes, whereas Fluentd messages are not. As a consequence, users might face issues with their tool integrations when they migrate from Fluentd to Vector. (link:https://issues.redhat.com/browse/LOG-7007[LOG-7007])
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