diff --git a/doc/reference.conf b/doc/reference.conf
index ee66aec6..4d2d4569 100644
--- a/doc/reference.conf
+++ b/doc/reference.conf
@@ -299,6 +299,9 @@ class "server" {
 	 */
 	max_autoconn = 1;
 
+	/* max_number: the maximum number of servers allowed in this class */
+	max_number = 100;
+
 	/* sendq: servers need a higher sendq as they are sent more data */
 	sendq = 2 megabytes;
 };