diff --git a/docs/datacollect/README.md b/docs/datacollect/README.md
index e5a42800..7a0607b5 100644
--- a/docs/datacollect/README.md
+++ b/docs/datacollect/README.md
@@ -87,7 +87,19 @@ PS: 同一节点只允许建立一条连接。
                         //基值, default: 0
                         "base": 0,
                         //系数, default: 1
-                        "coef": 1
+                        "coef": 1,
+                        //限值1, default: 0
+                        "limit1Enable": 0,
+                        //限值1下限
+                        "limit1Low": 123.0,
+                        //限值1上限
+                        "limit1High": 999.0,
+                        //限值2, default: 0
+                        "limit2Enable": 0,
+                        //限值2上限
+                        "limit2High": 999.0,
+                        //限值2下限
+                        "limit2Low": 0.0
                     }
                 },
                 {