diff --git a/java-core/google-cloud-core/src/test/java/com/google/cloud/BaseSerializationTest.java b/java-core/google-cloud-core/src/test/java/com/google/cloud/BaseSerializationTest.java
index 5dcd1726bb..422ecf7777 100644
--- a/java-core/google-cloud-core/src/test/java/com/google/cloud/BaseSerializationTest.java
+++ b/java-core/google-cloud-core/src/test/java/com/google/cloud/BaseSerializationTest.java
@@ -34,6 +34,10 @@
  * {@code restorableObjects()} method to return all restorable objects whose state must be tested
  * for proper serialization. Both methods can return {@code null} if no such object needs to be
  * tested.
+ * <p>
+ * This class has not migrated to Junit 5 because downstream libraries, e.g., java-logging,
+ * are extending this class and these libraries still use Junit 4.
+ * Migrating this class to Junit 5 will cause test failures in downstream libraries.
  */
 public abstract class BaseSerializationTest {
 
diff --git a/java-core/pom.xml b/java-core/pom.xml
index 4b4daa8900..e2dd8a86be 100644
--- a/java-core/pom.xml
+++ b/java-core/pom.xml
@@ -37,6 +37,7 @@
         <type>pom</type>
         <scope>import</scope>
       </dependency>
+      <!-- Test dependencies -->
       <dependency>
         <groupId>org.junit</groupId>
         <artifactId>junit-bom</artifactId>
@@ -44,7 +45,6 @@
         <type>pom</type>
         <scope>import</scope>
       </dependency>
-      <!-- Test dependencies -->
       <dependency>
         <groupId>com.google.truth</groupId>
         <artifactId>truth</artifactId>