Docs: SPF lookup type

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index e482088990c0ec387f8db4ef9655f86e68b220bf..c0b84aa0c3586482ececac9d876d1f9f613efb41 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -6733,6 +6733,12 @@ be followed by optional colons.
 &*Warning*&: Unlike most other single-key lookup types, a file of data for
 &((n)wildlsearch)& can &'not'& be turned into a DBM or cdb file, because those
 lookup types support only literal keys.
+
+.next
+.cindex "lookup" "spf"
+If Exim is built with SPF support, manual lookups can be done
+(as opposed to the standard ACL condition method.
+For details see section &<<SECSPF>>&.
 .endlist ilist