diff --git a/core/src/main/java/org/opensearch/sql/ast/tree/Trendline.java b/core/src/main/java/org/opensearch/sql/ast/tree/Trendline.java
index 3f9f9e2fbc..aa4fcc200d 100644
--- a/core/src/main/java/org/opensearch/sql/ast/tree/Trendline.java
+++ b/core/src/main/java/org/opensearch/sql/ast/tree/Trendline.java
@@ -66,7 +66,6 @@ public <R, C> R accept(AbstractNodeVisitor<R, C> nodeVisitor, C context) {
   }
 
   public enum TrendlineType {
-    SMA,
-    WMA
+    SMA
   }
 }
diff --git a/docs/user/ppl/cmd/trendline.rst b/docs/user/ppl/cmd/trendline.rst
index 4e528508f9..166a3c056f 100644
--- a/docs/user/ppl/cmd/trendline.rst
+++ b/docs/user/ppl/cmd/trendline.rst
@@ -19,9 +19,9 @@ Syntax
 
 * [+|-]: optional. The plus [+] stands for ascending order and NULL/MISSING first and a minus [-] stands for descending order and NULL/MISSING last. **Default:** ascending order and NULL/MISSING first.
 * sort-field: mandatory when sorting is used. The field used to sort.
-* number-of-datapoints: mandatory. number of datapoints to calculate the moving average (must be greater than zero).
-* field: mandatory. the name of the field the moving average should be calculated for.
-* alias: optional. the name of the resulting column containing the moving average.
+* number-of-datapoints: mandatory. The number of datapoints to calculate the moving average (must be greater than zero).
+* field: mandatory. The name of the field the moving average should be calculated for.
+* alias: optional. The name of the resulting column containing the moving average (defaults to the field name with "_trendline").
 
 And the moment only the Simple Moving Average (SMA) type is supported.