diff --git a/parquet-hadoop/src/main/java/org/apache/parquet/hadoop/metadata/ParquetMetadata.java b/parquet-hadoop/src/main/java/org/apache/parquet/hadoop/metadata/ParquetMetadata.java
index 8ddf6ecf57..640ecfba1b 100755
--- a/parquet-hadoop/src/main/java/org/apache/parquet/hadoop/metadata/ParquetMetadata.java
+++ b/parquet-hadoop/src/main/java/org/apache/parquet/hadoop/metadata/ParquetMetadata.java
@@ -35,10 +35,11 @@ public class ParquetMetadata {
 
   private static final ObjectMapper objectMapper = new ObjectMapper();
 
-  // Enable FAIL_ON_EMPTY_BEANS on objectmapper. Without this feature parquet-casdacing tests fail,
-  // because LogicalTypeAnnotation implementations are classes without any property.
   static {
+    // Enable FAIL_ON_EMPTY_BEANS on objectmapper. Without this feature parquet-casdacing tests fail,
+    // because LogicalTypeAnnotation implementations are classes without any property.
     objectMapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
+    // Add support for Java 8 Optional
     objectMapper.registerModule(new Jdk8Module());
   }
 
diff --git a/parquet-jackson/pom.xml b/parquet-jackson/pom.xml
index 47b1aab7d0..e847b795dd 100644
--- a/parquet-jackson/pom.xml
+++ b/parquet-jackson/pom.xml
@@ -43,6 +43,7 @@
       <artifactId>jackson-databind</artifactId>
       <version>${jackson-databind.version}</version>
     </dependency>
+    <!-- Add support for Java 8 Optional -->
     <dependency>
       <groupId>com.fasterxml.jackson.datatype</groupId>
       <artifactId>jackson-datatype-jdk8</artifactId>