diff --git a/mwc-probability-transition.cabal b/mwc-probability-transition.cabal
--- a/mwc-probability-transition.cabal
+++ b/mwc-probability-transition.cabal
@@ -1,5 +1,5 @@
 name:                mwc-probability-transition
-version:             0.3.0.0
+version:             0.3.0.1
 synopsis:            A Markov stochastic transition operator with logging
 description:
             .
@@ -12,7 +12,7 @@
 author:              Marco Zocca
 maintainer:          zocca.marco gmail
 copyright:           2018 Marco Zocca
-category:            Numeric
+category:            Numeric, Random, Science, Scientific Simulation, Statistical Modeling, Statistics
 build-type:          Simple
 extra-source-files:  README.md
 cabal-version:       >=1.10