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diff --git a/doc/statements.txt b/doc/statements.txt
index 607aee13..9155f286 100644
--- a/doc/statements.txt
+++ b/doc/statements.txt
@@ -218,6 +218,11 @@ has to be assigned before a conntrack lookup takes place, i.e. this has to be
done in prerouting and possibly output (if locally generated packets need to be
placed in a distinct zone), with a hook priority of -300.
+Unlike iptables, where the helper assignment happens in the raw table,
+the helper needs to be assigned after a conntrack entry has been
+found, i.e. it will not work when used with hook priorities equal or before
+-200.
+
.Conntrack statement types
[options="header"]
|==================