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-rw-r--r--doc/doc-docbook/spec.xfpt14
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diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index dcf6b6cfb..cde80a17c 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -8758,6 +8758,20 @@ string easier to understand.
This item inserts &"basic"& header lines. It is described with the &%header%&
expansion item below.
+
+.vitem "&*${acl{*&<&'name'&>&*}{*&<&'string'&>&*}}*&"
+.cindex "expansion" "calling an acl"
+.cindex "&%acl%&" "call from expansion"
+The name and <&'string'&> are first expanded separately. The expanded
+<&'string'&> is assigned to the &$address_data$& variable. If {<&'string'&>}
+is omitted, &$address_data$& is made empty. The named ACL (see chapter
+&<<CHAPACL>>&) is called and may use &$address_data$&. If the ACL sets
+a value using a "message =" modifier and returns accept, the value becomes
+the result of the expansion.
+If no message was set but the ACL returned accept, or if the ACL returned defer,
+the value is an empty string. Otherwise the expansion fails.
+
+
.vitem "&*${dlfunc{*&<&'file'&>&*}{*&<&'function'&>&*}{*&<&'arg'&>&*}&&&
{*&<&'arg'&>&*}...}*&"
.cindex &%dlfunc%&