diff --git a/stl-decomp-4j/pom.xml b/stl-decomp-4j/pom.xml
index ce2b182..bee1a17 100644
--- a/stl-decomp-4j/pom.xml
+++ b/stl-decomp-4j/pom.xml
@@ -76,6 +76,9 @@
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
         <version>2.9.1</version>
+        <configuration>
+          <source>8</source>
+        </configuration>
         <executions>
           <execution>
             <id>attach-javadocs</id>
diff --git a/stl-decomp-4j/src/main/java/com/github/servicenow/ds/stats/stl/CyclicSubSeriesSmoother.java b/stl-decomp-4j/src/main/java/com/github/servicenow/ds/stats/stl/CyclicSubSeriesSmoother.java
index d6cc725..9c6f174 100644
--- a/stl-decomp-4j/src/main/java/com/github/servicenow/ds/stats/stl/CyclicSubSeriesSmoother.java
+++ b/stl-decomp-4j/src/main/java/com/github/servicenow/ds/stats/stl/CyclicSubSeriesSmoother.java
@@ -13,7 +13,7 @@ public class CyclicSubSeriesSmoother {
 	private final double[][] fRawCyclicSubSeries;
 	private final double[][] fSmoothedCyclicSubSeries;
 
-	// reshaped version of exogenous inputs with an extra dimension created to form subseries with respect to the periodicity,
+	// reshaped version of exogenous inputs with an extra dimension created to form sub-series with respect to the periodicity,
 	// thereby leading to the dimensions [periodicity][numOfExogData][numOfDataInEachCycle]
 	private final double[][][] fExogenousCyclicSeries;
 
@@ -110,9 +110,10 @@ public Builder setPeriodicity(int periodicity) {
 		}
 
 		/**
-		 * Get the exogenous data inputs that was decomposed
+		 * Set the exogenous data inputs
 		 *
-		 * @return double[][] the exogenous data inputs
+		 * @param exogenousData exogenous independent variables that may have affected the input data
+		 * @return this
 		 */
 		public Builder setExogenousData(double[][] exogenousData) {
 			fExogenousData = exogenousData;