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-rw-r--r--doc/doc-docbook/spec.xfpt5
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index d8cf6e73c..834f210ce 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -6741,6 +6741,11 @@ lookup types support only literal keys.
&*Warning 2*&: In a host list, you must always use &(net-iplsearch)& so that
the implicit key is the host's IP address rather than its name (see section
&<<SECThoslispatsikey>>&).
+
+.new
+&*Warning 3*&: Do not use an IPv4-mapped IPv6 address for a key; use the
+IPv4. Such addresses being searched for are converted to IPv4.
+.wen
.next
.new
.cindex lookup json