diff --git a/config/vufind/config.ini b/config/vufind/config.ini
index ee34534db38b092575efb32323950612f6a859f4..aa8bd84cd404f61b5f1ff244212b761db13052bc 100644
--- a/config/vufind/config.ini
+++ b/config/vufind/config.ini
@@ -447,7 +447,9 @@ url = "https://api.booksite.com"
 url              = "http://contentcafe2.btol.com"
 pw               = "Password"
 
-; Summon is Optional.  See also the separate Summon.ini file.
+; Summon is optional; this section is used for your API credentials. apiId is the
+; short, human-readable identifier for your Summon account; apiKey is the longer,
+; non-human-readable secret key. See also the separate Summon.ini file.
 ;[Summon]
 ;apiId        = myAccessId
 ;apiKey       = mySecretKey