diff --git a/inf-backprop.cabal b/inf-backprop.cabal
--- a/inf-backprop.cabal
+++ b/inf-backprop.cabal
@@ -5,9 +5,9 @@
 -- see: https://github.com/sol/hpack
 
 name:           inf-backprop
-version:        0.1.0.0
+version:        0.1.0.1
 synopsis:       Automatic differentiation and backpropagation.
-description:    ![Second order derivative of a composition](doc/images/composition_second_derivative.png)
+description:    ![Second order derivative of a composition](docs/doc/images/composition_second_derivative.png)
                 .
                 Automatic differentiation and backpropagation.
                 We do not attract gradient tape.
@@ -16,8 +16,8 @@
                 .
                 The original purpose of the package is an automatic backpropagation differentiation component
                 for a functional type-dependent library for deep machine learning.
-                See [tutorial](InfBackprop-Tutorial.html) details.
-category:       Math
+                See [tutorial](docs/InfBackprop-Tutorial.html) details.
+category:       Mathematics
 author:         Alexey Tochin
 maintainer:     Alexey.Tochin@gmail.com
 copyright:      2023 Alexey Tochin