Docs: tweak ARC description

diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt
index 0ad7f0de9a01f502fa49ff41072ed4c37e3a81ff..49935fb401e2a0523c1e2c743371da536f5c8ce4 100644 (file)
--- a/doc/doc-txt/experimental-spec.txt
+++ b/doc/doc-txt/experimental-spec.txt
@@ -803,7 +803,7 @@ standard header.
        Note that it would be wise to strip incoming messages of A-R headers
        that claim to be from our own <admd-identifier>.
 
-There are three new variables: $arc_state, $arc_state_reason, $arc_domains:
+There are four new variables:
 
   $arc_state           One of pass, fail, none
   $arc_state_reason    (if fail, why)