diff --git a/ocs/diag_note.md b/ocs/diag_note.md
index f1d9ef4..95d6993 100644
--- a/ocs/diag_note.md
+++ b/ocs/diag_note.md
@@ -1,3 +1,6 @@
+0. 设置topo
+    python3 ocsdiag.py -i 10.57.216.95,10.57.216.96,10.57.216.97,10.57.216.98 -e 2,4,6,8 -c topo-config -p 32
+
 1. 设置low freq 128 ,high freq 0  （最大）
     python3 ocsdiag.py -i 10.57.216.97 -e 8 -s all -c reg-wt -p lowfreq_eq -v 128
     python3 ocsdiag.py -i 10.57.216.97 -e 8 -s all -c reg-wt -p highfreq_eq -v 0