diff --git a/CHANGELOG.md b/CHANGELOG.md
index 75eeb3c..68fa577 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,9 +6,35 @@ Release History
 ------------------
 
 * bug fixes for Python 3;
-* bug fixes in the scripts installed in */usr/local/bin*.
+* bug fixes in the scripts in *./bin*.
 
 0.4.2 (2015-10-05)
 ------------------
 
 * first stable release on PypI.
+
+0.4 (2012-01-02)
+----------------
+
+This release introduces a more advanced LSB (Least Significant Bit) method
+based on integers sets. The sets generated with Python generators
+(Sieve of Eratosthenes, Fermat, Carmichael numbers, etc.) are used to select
+the pixels used to hide the information. You can use these new methods in your
+Python codes as a Python module or as a program in your scripts.
+
+0.3 (2011-04-15)
+----------------
+
+* you can now use Stéganô as a library in your Python program
+(python setup.py install) or as a 'program' thanks to the scripts provided
+in the bin directory;
+* new documentation (reStructuredText) comes with Stéganô.
+
+0.2 (2011-03-24)
+----------------
+
+* this release introduces some bugfixes and a major speed improvement of the
+*reveal* function for the LSB method. Moreover it is now possible to hide a
+binary file (ogg, executable, etc.);
+* a new technique for hiding/revealing a message in a JPEG picture by using the
+description field of the image is provided.