diff --git a/testable-agent/src/main/java/com/alibaba/testable/agent/util/ClassUtil.java b/testable-agent/src/main/java/com/alibaba/testable/agent/util/ClassUtil.java
index bd9f38f..87d2197 100644
--- a/testable-agent/src/main/java/com/alibaba/testable/agent/util/ClassUtil.java
+++ b/testable-agent/src/main/java/com/alibaba/testable/agent/util/ClassUtil.java
@@ -147,7 +147,7 @@ public class ClassUtil {
     /**
      * get method name and descriptor to convert wrapper type to primary type
      * @param primaryType byte code of private type
-     * @return pair of <method-name, method-descriptor>
+     * @return pair of [method-name, method-descriptor]
      */
     public static ImmutablePair<String, String> getWrapperTypeConvertMethod(byte primaryType) {
         return WRAPPER_METHOD_MAPPING.get(primaryType);
diff --git a/testable-agent/src/main/java/com/alibaba/testable/agent/util/CollectionUtil.java b/testable-agent/src/main/java/com/alibaba/testable/agent/util/CollectionUtil.java
index 3d85fd9..f69c5e5 100644
--- a/testable-agent/src/main/java/com/alibaba/testable/agent/util/CollectionUtil.java
+++ b/testable-agent/src/main/java/com/alibaba/testable/agent/util/CollectionUtil.java
@@ -27,6 +27,7 @@ public class CollectionUtil {
     /**
      * Generate a list of item
      * @param items elements to add
+     * @param <T> type of element
      * @return a ArrayList of provided elements
      */
     public static <T> List<T> listOf(T... items) {