diff --git a/ANNOUNCEMENT b/ANNOUNCEMENT
index c37fe017..7c6e9430 100644
--- a/ANNOUNCEMENT
+++ b/ANNOUNCEMENT
@@ -1,7 +1,7 @@
-liblouisutdml 2.11.0 has been released
+liblouisutdml 2.12.0 has been released
 
 The liblouis developer team is proud to announce the liblouisutdml
-release 2.11.0. The release is available for download at:
+release 2.12.0. The release is available for download at:
 
 https://github.com/liblouis/liblouisutdml/releases
 
@@ -17,7 +17,9 @@ grade two, mathematical codes, etc.
 Noteworthy changes in this release
 ==================================
 
-This minor Liblouisutdml release adds support for liblouis 3.20 and up.
+This Liblouisutdml release brings major improvements to Nemeth Math
+handling thanks to Attila Hammer and Norbert Markus. It also adds
+support for liblouis 3.27.
 
 For a detailed list of all the changes refer to the list of closed
 issues [2]_.
@@ -25,12 +27,76 @@ issues [2]_.
 New features
 ------------
 
--  Add support for liblouis 3.20
+-  Add support for liblouis 3.27
+-  Major upgrade to Nemeth Math handling thanks to Attila Hammer and
+   Norbert Markus.
+
+   -  The order of some character definitions and include statements
+      have been changed so that the now updated Nemeth Braille dot
+      patterns of mathematical symbols take precedence over the literary
+      Braille patterns for the same Unicode characters. E.g. the
+      horizontal ellipsis, and division sign are among those affected.
+   -  Now the caret symbol appears with its intended Nemeth Braille dot
+      pattern.
+   -  The colon and semicolon as mathematical symbols appear with a
+      punctuation prefix (dots 456-25 and dots 456-23) and a space is
+      added after them. The space may be skipped depending on the
+      context.
+   -  A number of rules have been disabled to give way to the now
+      updated Nemeth Braille dot patterns of mathematical symbols in
+      ``nemethdefs.cti``.
+   -  The list of function names and abbreviations has been extended
+      with items (e.g. two-letter abbreviations of function names and
+      their combinations).
+   -  Indication of subscripts and superscripts has been improved and
+      consolidated. E.g., numeric subscripts are now either indicated or
+      not indicated by a subscript prefix as required. However,
+      multilevel subscripts and superscripts are not (yet) covered as it
+      requires keeping track of the current level.
+   -  A number sign is inserted before the first digit following a dot 5
+      or dots 56 (also in combinations with a minus sign) if that prefix
+      is the first cell in the block or after a space.
+   -  Now a single digit or letter with overbar is handled correctly.
+      Previously a two-step rule had the side-effect of deleting dot 5
+      from dots 5-13-156 even when this sequence appeared as part of
+      signs of comparison (less than or equal to, etc). Now those signs
+      of comparison, including those for sets are correctly displayed.
+      The solution does not yet cover letters of another alphabet or
+      type form. Such instances are displayed using the uncontracted
+      five-step Nemeth rule.
+   -  Support for the contracted indication of a horizontal bar under a
+      single digit or letter is added (dots 146-156 following the digit
+      or letter) according to a 2013 BANA update to Nemeth Rule XIV. The
+      solution does not yet cover letters of another alphabet or
+      typeform. Such instances are displayed using the uncontracted
+      five-step Nemeth rule.
+   -  Now a Nemeth rule for repeating decimals is observed. When a
+      series of digits have each a dot above in print to mark a
+      repeating period, it is sufficient to show a single dot in
+      Braille. The modification block, however, applies to all the
+      digits affected.
+   -  The decimal point now appears correctly (dots 46) even when
+      preceding or following a dot five which indicates the beginning of
+      a modification.
+   -  A space is inserted between the Braille representation of ``{}``
+      for the empty set.
+   -  The space is removed from between a grouping symbol and a
+      horizontal ellipsis in various combinations.
+   -  The space between a function name/abbreviation and a superscript
+      belonging to it is removed. In case of a log and colog, a
+      subscript is expected. Note that the current solution is far from
+      perfect as processing function names and their surroundings could
+      better be done by an algorithm.
+   -  Any series of Multiple spaces in the math blocks are reduced to a
+      single space at that place.
 
 Other
 -----
 
--  Add Lithuanian hyphenation table
+-  Fix a memory leak thanks to Samuel Thibault
+-  Add missing declarations to louisutdml.h, thanks to Peter Fordham for
+   the report
+-  Update gnulib
 
 Share and Enjoy!
 
@@ -43,4 +109,4 @@ Footnotes
    https://github.com/liblouis/liblouis
 
 .. [2]
-   https://github.com/liblouis/liblouisutdml/milestone/7?closed=1
+   https://github.com/liblouis/liblouisutdml/milestone/8?closed=1