diff --git a/README.md b/README.md
index 03fcd77..9e685b6 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,3 @@
 # ruby-asciidoctor
 
+An implementation of AsciiDoc in Ruby.
diff --git a/asciidoctor-2.0.15.gem b/asciidoctor-2.0.15.gem
new file mode 100644
index 0000000..5c37df3
Binary files /dev/null and b/asciidoctor-2.0.15.gem differ
diff --git a/ruby-asciidoctor.spec b/ruby-asciidoctor.spec
new file mode 100644
index 0000000..b7337bd
--- /dev/null
+++ b/ruby-asciidoctor.spec
@@ -0,0 +1,56 @@
+%define        gemdir   %(ruby -rrubygems -e'puts Gem.default_dir')
+%define        gemname  %(echo %{name} | sed "s|^ruby-||")
+Name:          ruby-asciidoctor
+Version:       2.0.15
+Release:       1mamba
+Summary:       An implementation of AsciiDoc in Ruby
+Group:         Applications/Publishing
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           https://asciidoctor.org
+Source:        https://rubygems.org/downloads/asciidoctor-%{version}.gem
+License:       MIT
+## AUTOBUILDREQ-BEGIN
+## AUTOBUILDREQ-END
+BuildRequires: ruby-devel >= 2.7.2
+Requires:      ruby >= 2.7.2
+Provides:      asciidoctor
+
+%description
+An implementation of AsciiDoc in Ruby.
+
+#% debug_package
+
+%prep
+%setup -q -c -a0
+
+%build
+
+%install
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+gem install --no-user-install --ignore-dependencies -i "%{buildroot}%{gemdir}" \
+   -n "%{buildroot}%{_bindir}" "%{SOURCE0}"
+
+install -D -m0644 %{gemname}-%{version}/man/asciidoctor.1 %{buildroot}%{_mandir}/man1/asciidoctor.1
+
+rm %{buildroot}%{gemdir}/cache/%{gemname}-%{version}.gem
+rm -rf %{buildroot}%{gemdir}/gems/%{gemname}-%{version}/man
+rm -rf %{buildroot}%{gemdir}/doc/%{gemname}-%{version}
+
+%clean
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+%files
+%defattr(-,root,root)
+%{_bindir}/asciidoctor
+%dir %{gemdir}/gems/%{gemname}-%{version}
+%{gemdir}/gems/%{gemname}-%{version}/*
+%{gemdir}/specifications/%{gemname}-%{version}.gemspec
+%{_libdir}/ruby/gems/*/gems/%{gemname}-%{version}/.*
+%{_mandir}/man1/asciidoctor.1*
+%doc %{gemname}-%{version}/LICENSE
+
+%changelog
+* Sat Jun 19 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 2.0.15-1mamba
+- package created using the webbuild interface