diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0292b86..81a295a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,19 +3,31 @@
 All notable changes to this project will be documented in this file. This
 project adheres to [Semantic Versioning].
 
-## [Unreleased]
+## [0.4.0] - 2019-08-02
 
 ### Added
 
-- Supports for the Java programming language have been added. The highlights
-  are achieved by reusing some existing pieces of syntax and by creating new
-  ones. Existing syntax groups have been remapped to other default syntax
-  groups and some new ones have been created for the occassion.
+- Supports for the **Java** programming language have been added.
 
-- Supports for the Ruby programming language have been added. Some highlights
-  of the existing syntax have been modified to better fit the color scheme. In
-  other words, some existing Ruby syntax groups have been linked to other
-  default syntax groups.
+  + Syntax for the 'import' and 'import static' statements have been added.
+
+  + Syntax rules for the type and classe names have been added. Everything that
+    matches the regexp "\u\w*" is globally considered to be a type or a class
+    name.
+
+  + Syntax rules for the enum values have been added. Everything that matches
+    the regexp "\u\w\+" is globally considered to be an enum value or a
+    constant. It must be noted that "\u" will be highlight as a type because it
+    is mostly used for type parametrization in generics.
+
+- Supports for the **Ruby** programming language have been added.
+
+  + 'require', 'def' and 'class' are highlighted as statements.
+
+  + Class and instance variables are highlighted in orange.
+
+  + String delimiters are highlighted as constants and string interpolation
+    delimiters are highlighted as functions.
 
 ### Changed
 
@@ -80,10 +92,10 @@ project adheres to [Semantic Versioning].
 
   The violet color is removed, and the yellow-green color is added.
 
-  |    Color    |    Name    |     Main usage    | Hue | Saturation | Value |
-  | ----------- | ---------- | ----------------- | --- | ---------- | ----- |
-  |     #add590 |     yellow |          Constant |  95 |     45     |   70  |
-  | ~~#6270b3~~ | ~~violet~~ |          Constant | 230 |     45     |   70  |
+  |    Color    |    Name    |     Main usage    |  Hue  | Saturation | Value |
+  | ----------- | ---------- | ----------------- | ----- | ---------- | ----- |
+  |     #add590 |     yellow |          Constant |   95  |     45     |   70  |
+  | ~~#6270b3~~ | ~~violet~~ |      ~~Constant~~ |~~230~~|   ~~45~~   | ~~70~~|
 
 - The highlight for MatchParen has been modified. In fact, when the cursor is
   over a parenthese, a bracket, a brace, and so on, the matching element turns
@@ -131,7 +143,7 @@ project adheres to [Semantic Versioning].
 
   + Otherwise, a GUI version of Vim must be used.
 
-[Unreleased]: https://github.com/ludokng/vim-odyssey/compare/0.3.0...HEAD
+[0.4.0]: https://github.com/ludokng/vim-odyssey/compare/0.3.0...0.4.0
 [0.3.0]: https://github.com/ludokng/vim-odyssey/compare/0.2.0...0.3.0
 [0.2.0]: https://github.com/ludokng/vim-odyssey/compare/0.1.0...0.2.0
 [Semantic Versioning]: https://semver.org/spec/v2.0.0.html
diff --git a/after/syntax/java.vim b/after/syntax/java.vim
index 09e61c4..5ec3277 100644
--- a/after/syntax/java.vim
+++ b/after/syntax/java.vim
@@ -3,16 +3,22 @@
 "                   / // __ `/| | / // __ `/  / /_ / __ \ / ___/
 "                  / // /_/ / | |/ // /_/ /  / __// /_/ // /
 "               __/ / \__,_/  |___/ \__,_/  /_/   \____//_/
-"              /___/         __
+"              /___/          __
 "                 ____   ____/ /__  __ _____ _____ ___   __  __
 "                / __ \ / __  // / / // ___// ___// _ \ / / / /
 "               / /_/ // /_/ // /_/ /(__  )(__  )/  __// /_/ /
 "               \____/ \__,_/ \__, //____//____/ \___/ \__, /
 "                            /____/                   /____/
 "
-"                           Write once, run anywhere
+" Note: This script aims at providing some new syntax element for Java. It
+" therefore declares syntax elements for:
+"   - Type and class names,
+"   - Enum values,
+"   - Import statements ('import' and 'import static').
 "
 " Maintainer: Ludovic Koenig <ludovic.koenig@gmail.com>
+" Version: 0.4.0
+" Since: 0.4.0
 " License: MIT
 "
 " Java Syntax {{{
diff --git a/colors/odyssey.vim b/colors/odyssey.vim
index f78a1f8..07b68a0 100644
--- a/colors/odyssey.vim
+++ b/colors/odyssey.vim
@@ -13,8 +13,9 @@
 " Odyssey.
 "
 " Maintainer: Ludovic Koenig <ludovic.koenig@gmail.com>
+" Version: 0.4.0
+" Since: 0.1.0
 " License: MIT
-" Release: 0.3.0
 "
 " Prelude {{{