diff --git a/ocs/diag_note.md b/ocs/diag_note.md
index 6f3c51f..9d71913 100644
--- a/ocs/diag_note.md
+++ b/ocs/diag_note.md
@@ -5,9 +5,13 @@
 2. 设置tia_peak 为 100，全局的lane 0和lane 3设置为0(最大)
     python3 ocsdiag.py -i 10.57.216.98 -e 8 -s all -c tia-peak-tune
 
-3. 校准ibias (onoc和onet通用)
+3. 校准ibias (onoc)
     python3 ocsdiag.py -i 10.57.216.98 -e 8 -s all -c ibias-auto-tune
 
+3.1 校准ibias (onet)
+    python3 ocsdiag.py -i 10.57.216.98 -e 8 -s all -c ibias-auto-tune
+    
+
 4. 校准mgc onoc
     python3 ocsdiag.py -i 10.57.216.98 -e 8 -c rtmr-prbs
     python3 ocsdiag.py -i 10.57.216.98 -e 8 -s all -c mgc-auto-tune