Update introduction.md

introduction.md

@@ -101,6 +101,20 @@ GlobalOS uses a custom persistence mechanism. It means in most of cases if you e
 * /etc/burst2d.cfg - killall burst2d
 * /etc/firewall.cfg - sh /etc/firewall.cfg
 
+For restarting accel you can use following snippet:
+```
+killall accel-pppd; while true; do
+    pid=$(pgrep accel-pppd)
+    if [ -z "$pid" ]; then
+        accel-pppd -c /etc/accel-ppp.conf -d
+        break
+    fi
+    echo "Waiting for accel-pppd to finish"
+    sleep 1
+done
+```
+
+
 ### Network diagnostics and troubleshooting
 
 If you have problems with network configuration, you can use following tools to diagnose the problem: