diff --git a/java/fury-core/src/main/java/org/apache/fury/reflect/TypeParameter.java b/java/fury-core/src/main/java/org/apache/fury/reflect/TypeParameter.java
index 2823cbd77e..1612e65c3f 100644
--- a/java/fury-core/src/main/java/org/apache/fury/reflect/TypeParameter.java
+++ b/java/fury-core/src/main/java/org/apache/fury/reflect/TypeParameter.java
@@ -19,6 +19,8 @@
 import java.lang.reflect.TypeVariable;
 import java.util.Objects;
 
+// Derived from Guava 32.1.2 com.google.common.reflect.TypeParameter
+// https://github.com/google/guava/blob/9f6a3840/guava/src/com/google/common/reflect/TypeParameter.java
 public abstract class TypeParameter<X> {
   final TypeVariable<?> typeVariable;
 
diff --git a/java/fury-core/src/main/java/org/apache/fury/reflect/TypeRef.java b/java/fury-core/src/main/java/org/apache/fury/reflect/TypeRef.java
index 9dae933ffc..9a41fa13ee 100644
--- a/java/fury-core/src/main/java/org/apache/fury/reflect/TypeRef.java
+++ b/java/fury-core/src/main/java/org/apache/fury/reflect/TypeRef.java
@@ -35,10 +35,8 @@
 import java.util.stream.Stream;
 import org.apache.fury.type.TypeUtils;
 
-/**
- * Mostly derived from Guava 32.1.2 com.google.common.reflect.TypeToken
- * https://github.com/google/guava/blob/master/guava/src/com/google/common/reflect/TypeToken.java
- */
+// Mostly derived from Guava 32.1.2 com.google.common.reflect.TypeToken
+// https://github.com/google/guava/blob/9f6a3840/guava/src/com/google/common/reflect/TypeToken.java
 public class TypeRef<T> {
 
   private final Type type;
diff --git a/java/fury-core/src/main/java/org/apache/fury/reflect/Types.java b/java/fury-core/src/main/java/org/apache/fury/reflect/Types.java
index 1f35786344..cbfc7cdb7a 100644
--- a/java/fury-core/src/main/java/org/apache/fury/reflect/Types.java
+++ b/java/fury-core/src/main/java/org/apache/fury/reflect/Types.java
@@ -27,6 +27,8 @@
 import java.util.Objects;
 import javax.annotation.CheckForNull;
 
+// Derived from Guava 32.1.2 com.google.common.reflect.Types
+// https://github.com/google/guava/blob/9f6a3840/guava/src/com/google/common/reflect/Types.java
 class Types {
   public static Type newArrayType(Type componentType) {
     if (componentType instanceof WildcardType) {