diff --git a/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java b/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java
index ee9b61af..8960e2c7 100644
--- a/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java
+++ b/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java
@@ -146,6 +146,7 @@ public class SIPCommander implements ISIPCommander {
         builder.append(strTmp, 0, 2);
         strTmp = String.format("%02X", parameter2);
         builder.append(strTmp, 0, 2);
+        //优化zoom变倍速率
         if ((combineCode2 > 0) && (combineCode2 <16))
         {
             combineCode2 = 16;