diff --git a/ANNOUNCE.md b/ANNOUNCE.md
index 33764c06..15f6bff2 100644
--- a/ANNOUNCE.md
+++ b/ANNOUNCE.md
@@ -3,7 +3,12 @@
 
 ## What is new?
 
-Big code and API refactorization.  As result, the API is more consistent and hopefully more intuitive to use.  For more info on the new API, see https://caterva.readthedocs.io.
+An API renaming has been done to adapt some Caterva variable names to those
+used by the general community.
+
+Also, a new level of multi-dimensionality has been introduced. As a result,
+unlike other libraries, Caterva supports two levels of multi-dimensional
+chunking (chunks and blocks).
 
 For more info, please see the release notes in:
 
@@ -12,11 +17,12 @@ https://github.com/Blosc/Caterva/blob/master/RELEASE_NOTES.md
 
 ## What is it?
 
-Caterva is an open source C library and a format that allows to store large multidimensional,
-chunked, compressed datasets.
+Caterva is an open source C library and a format that allows to store large
+multidimensional, chunked, compressed datasets.
 
-Data can be stored either in-memory or on-disk, but the API to handle both versions is the same.
-Compression is handled transparently for the user by adopting the Blosc2 library.
+Data can be stored either in-memory or on-disk, but the API to handle both
+versions is the same. Compression is handled transparently for the user by
+adopting the Blosc2 library.
 
 ## Download sources
 
@@ -29,7 +35,8 @@ Caterva is distributed using the BSD license, see
 
 ## Mailing list
 
-There is an official Blosc mailing list where discussions about Caterva are welcome:
+There is an official Blosc mailing list where discussions about Caterva are
+welcome:
 
 blosc@googlegroups.com
 
diff --git a/RELEASE_NOTES.rst b/RELEASE_NOTES.rst
index 863fbbc6..3ee03b8d 100644
--- a/RELEASE_NOTES.rst
+++ b/RELEASE_NOTES.rst
@@ -1,6 +1,25 @@
 Release notes
 =============
 
+Changes from 0.3.3 to 0.4.0
+---------------------------
+
+* API renaming. The function names simulate a *namespace* and some
+  variable names have been changed to those used by the general community
+  (*part -> chunk*).
+
+* Add a new level of multi-dimensionality. As a result, unlike other
+  libraries, Caterva supports two levels of multi-dimensional chunking (chunks
+  and blocks).
+
+* Improve library compilation to allow users to avoid building tests and
+  examples.
+
+* Simplify the test's suite for a proper integration in Windows.
+
+* Update documentation to improve the library description and to add the
+  *Release notes* and the *Roadmap* in a new section.
+
 Changes from 0.3.0 to 0.3.3
 ---------------------------
 
diff --git a/RELEASING.rst b/RELEASING.rst
index 6c998393..1f39e693 100644
--- a/RELEASING.rst
+++ b/RELEASING.rst
@@ -8,7 +8,7 @@ Preliminaries
 
     git checkout master
 
-- Make sure that ``RELEASE_NOTES.md`` and ``ANNOUNCE.md`` are up to
+- Make sure that ``RELEASE_NOTES.rst`` and ``ANNOUNCE.rst`` are up to
   date with the latest news in the release.
 
 - Check that *VERSION* symbols in caterva/caterva.h contains the correct info.
diff --git a/caterva/caterva.h b/caterva/caterva.h
index 640df18b..3335834b 100644
--- a/caterva/caterva.h
+++ b/caterva/caterva.h
@@ -26,12 +26,12 @@
 
 
 /* Version numbers */
-#define CATERVA_VERSION_MAJOR    0    /* for major interface/format changes  */
-#define CATERVA_VERSION_MINOR    3    /* for minor interface/format changes  */
-#define CATERVA_VERSION_RELEASE  3    /* for tweaks, bug-fixes, or development */
+#define CATERVA_VERSION_MAJOR    0   /* for major interface/format changes  */
+#define CATERVA_VERSION_MINOR    4   /* for minor interface/format changes  */
+#define CATERVA_VERSION_RELEASE  0   /* for tweaks, bug-fixes, or development */
 
-#define CATERVA_VERSION_STRING   "0.3.3"  /* string version.  Sync with above! */
-#define CATERVA_VERSION_DATE     "2020-04-27"    /* date version */
+#define CATERVA_VERSION_STRING   "0.4.0"  /* string version. Sync with above! */
+#define CATERVA_VERSION_DATE     "2020-07-28"    /* date version */
 
 
 /* Error handling */