diff --git a/src/de/inetsoftware/classparser/ClassFile.java b/src/de/inetsoftware/classparser/ClassFile.java
index cba4ca4..120230b 100644
--- a/src/de/inetsoftware/classparser/ClassFile.java
+++ b/src/de/inetsoftware/classparser/ClassFile.java
@@ -1,5 +1,5 @@
 /*
-   Copyright 2011 - 2020 Volker Berlin (i-net software)
+   Copyright 2011 - 2021 Volker Berlin (i-net software)
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
@@ -303,6 +303,7 @@ public class ClassFile {
      * http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.1-200-E
      * http://docs.oracle.com/javase/specs/jvms/se5.0/html/ClassFile.doc.html#23242
      * @see java.lang.Class#isInterface()
+     * @return the flag
      */
     public int getAccessFlags() {
         return accessFlags;
@@ -335,6 +336,7 @@ public class ClassFile {
 
     /**
      * Get the signature of the class with generic types.
+     * @return the signature
      */
     public String getThisSignature() {
         return thisSignature;
@@ -342,6 +344,7 @@ public class ClassFile {
 
     /**
      * Get the signature of the super class with generic types.
+     * @return the signature
      */
     public String getSuperSignature() {
         return superSignature;
diff --git a/src/de/inetsoftware/classparser/LineNumberTable.java b/src/de/inetsoftware/classparser/LineNumberTable.java
index 58be1f1..a219a91 100644
--- a/src/de/inetsoftware/classparser/LineNumberTable.java
+++ b/src/de/inetsoftware/classparser/LineNumberTable.java
@@ -1,5 +1,5 @@
 /*
-   Copyright 2011 - 2017 Volker Berlin (i-net software)
+   Copyright 2011 - 2021 Volker Berlin (i-net software)
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
@@ -35,6 +35,7 @@ public class LineNumberTable {
      * @param input
      *            the stream of the class
      * @throws IOException
+     *             if any i/O error occur
      */
     LineNumberTable( DataInputStream input ) throws IOException {
         int count = input.readUnsignedShort();
@@ -79,7 +80,7 @@ public class LineNumberTable {
 
     /**
      * Get the line number of the last code block.
-     * @return
+     * @return the line number
      */
     public int getLastLineNr() {
         return line_number[line_number.length - 1];
diff --git a/src/de/inetsoftware/jwebassembly/WasmException.java b/src/de/inetsoftware/jwebassembly/WasmException.java
index a15eb8d..fb3d590 100644
--- a/src/de/inetsoftware/jwebassembly/WasmException.java
+++ b/src/de/inetsoftware/jwebassembly/WasmException.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2017 - 2019 Volker Berlin (i-net software)
+ * Copyright 2017 - 2021 Volker Berlin (i-net software)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -108,6 +108,8 @@ public class WasmException extends RuntimeException {
      *            the source file of the Java code
      * @param className
      *            the class name of the Java code
+     * @param methodName
+     *            the method of the Java code
      * @param lineNumber
      *            the line number in Java Code
      * @return a new instance