diff --git a/conf/frpc.ini b/conf/frpc.ini
index e5dc863d..98517708 100644
--- a/conf/frpc.ini
+++ b/conf/frpc.ini
@@ -1,4 +1,7 @@
+# [common] is integral section
 [common]
+# A literal address or host name for IPv6 must be enclosed
+# in square brackets, as in "[::1]:80", "[ipv6-host]:http" or "[ipv6-host%zone]:80"
 server_addr = 0.0.0.0
 server_port = 7000
 # if you want to connect frps by http proxy, you can set http_proxy here or in global environment variables