diff --git a/conf/frpc_full.ini b/conf/frpc_full.ini
index 11e4d357..7aacfebf 100644
--- a/conf/frpc_full.ini
+++ b/conf/frpc_full.ini
@@ -68,8 +68,10 @@ tls_enable = true
 meta_var1 = 123
 meta_var2 = 234
 
-# specify udp packet size, unit is byte
-udp_packet_size = 1024
+# specify udp packet size, unit is byte. If not set, the default value is 1500.
+# This parameter should be same between client and server.
+# It affects the udp and sudp proxy.
+udp_packet_size = 1500
 
 # 'ssh' is the unique proxy name
 # if user in [common] section is not empty, it will be changed to {user}.{proxy} such as 'your_name.ssh'
diff --git a/conf/frps_full.ini b/conf/frps_full.ini
index cf6a649d..c0ffb76f 100644
--- a/conf/frps_full.ini
+++ b/conf/frps_full.ini
@@ -113,8 +113,10 @@ tcp_mux = true
 # custom 404 page for HTTP requests
 # custom_404_page = /path/to/404.html
 
-# specify udp packet size, unit is byte
-udp_packet_size = 1024
+# specify udp packet size, unit is byte. If not set, the default value is 1500.
+# This parameter should be same between client and server.
+# It affects the udp and sudp proxy.
+udp_packet_size = 1500
 
 [plugin.user-manager]
 addr = 127.0.0.1:9000