diff --git a/commands.md b/commands.md
index 632ac3f..de1140f 100644
--- a/commands.md
+++ b/commands.md
@@ -97,7 +97,8 @@ netstat -an                             # display all connections
 netstat -m                              # display buffer usage
 netstat -Lan                            # display status of listen queues
 sysctl kern.ipc.numopensockets          # display number of open sockets
-
+vmstat -z | egrep "ITEM|tcpcb"          # number of hash table buckets to handle incoming tcp connections
+                                          increase net.inet.tcp.tcbhashsize if hitting the limit
 ```
 
 # Firewall