diff --git a/azure-client-runtime/src/main/java/com/microsoft/azure/TaskGroupBase.java b/azure-client-runtime/src/main/java/com/microsoft/azure/TaskGroupBase.java
index d670876e10b9..d5a3a6250d2c 100644
--- a/azure-client-runtime/src/main/java/com/microsoft/azure/TaskGroupBase.java
+++ b/azure-client-runtime/src/main/java/com/microsoft/azure/TaskGroupBase.java
@@ -21,6 +21,9 @@
  */
 public abstract class TaskGroupBase<T, U extends TaskItem<T>>
     implements TaskGroup<T, U> {
+    /**
+     * Stores the tasks in this group and their dependency information.
+     */
     private DAGraph<U, DAGNode<U>> dag;
 
     /**
diff --git a/build-tools/src/main/resources/checkstyle.xml b/build-tools/src/main/resources/checkstyle.xml
index b7f934898253..d382291b82d9 100644
--- a/build-tools/src/main/resources/checkstyle.xml
+++ b/build-tools/src/main/resources/checkstyle.xml
@@ -79,11 +79,6 @@
         <property name="eachLine" value="true"/>
     </module>
 
-    <module name="RegexpSingleline">
-        <property name="format" value="\s+$"/>
-        <property name="message" value="Line has trailing spaces."/>
-    </module>
-
     <module name="TreeWalker">
         <!-- Checks for Javadoc comments.                     -->
         <!-- See http://checkstyle.sf.net/config_javadoc.html -->