diff --git a/ChangeLog.md b/ChangeLog.md
index ed3e43e..e1b325c 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -2,6 +2,17 @@
 All notable changes to `libpll` will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [0.3.1] - 2017-05-17
+### Added
+ - Checks for older versions of clang and gcc to use assembly instructions
+   for cpu features detection
+ - Include guards for pll.h
+### Fixed
+ - Correct updating of padded eigen-decomposition arrays for models with a
+   number of states not being a power of two
+ - Changed to the usage of builtin functions for cpu features detection
+ - Check for x86intrin.h
+
 ## [0.3.0] - 2017-05-15
 ### Added
  - Run-time detection of cpu features
diff --git a/configure.ac b/configure.ac
index 62ba2db..377b391 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.63])
-AC_INIT([libpll], [0.3.0], [Tomas.Flouri@h-its.org])
+AC_INIT([libpll], [0.3.1], [Tomas.Flouri@h-its.org])
 AM_INIT_AUTOMAKE([subdir-objects])
 AC_LANG([C])
 AC_CONFIG_SRCDIR([src/pll.c])
diff --git a/man/libpll.3 b/man/libpll.3
index 2ff6344..7ab05ed 100644
--- a/man/libpll.3
+++ b/man/libpll.3
@@ -586,5 +586,10 @@ for custom printing. Fixed derivatives computation, parsing of branch lengths,
 invariant sites computation, log-likelihood computation for cases where we have
 scaling and patterns, ascertainment bias computation, per-site log-likelihood
 computation, memory leaks. Added run-time detection of hardware.
+.TP
+.BR v0.3.1\~ "released May 17th, 2017"
+Correct updating of paddded eigen-decomposition arrays for models with a number
+of states not being a power of two. Added portable hardware detection for clang
+and GCC. 
 .RE
 .LP