diff --git a/Performance-Tuning.md b/Performance-Tuning.md
index 696fdd5..66f5fd4 100644
--- a/Performance-Tuning.md
+++ b/Performance-Tuning.md
@@ -4,7 +4,7 @@
 
 BDP (byte) = Link speed (bit/s) * RTT (s) / 8 (bit/byte). Under the default effect of `net.ipv4.tcp_adv_win_scale`, BDP * 2 should be a good setting for maximum receive buffer size. 
 
-Example: Assuming 1Gbps link with 200ms RTT, it's a 24MiB window size requiring 48MiB buffer size. Add `net.ipv4.tcp_rmem = 4096 131072 67108864` to client-side sysctl.conf, `net.ipv4.tcp_wmem = 4096 131072 67108864` to server-side sysctl.conf.
+Example: Assuming 1Gbps link with 256ms RTT, it's a 32MiB window size requiring 64MiB buffer size. Add `net.ipv4.tcp_rmem = 4096 131072 67108864` to client-side sysctl.conf, `net.ipv4.tcp_wmem = 4096 131072 67108864` to server-side sysctl.conf.
 
 * https://blog.cloudflare.com/the-story-of-one-latency-spike/
 * https://blog.cloudflare.com/optimizing-tcp-for-high-throughput-and-low-latency