diff --git a/README.md b/README.md
index 56abeec..0594364 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # s4
 
+S4 is a frequency domain code to solve layered periodic structures. Internally, it uses Rigorous Coupled Wave Analysis (RCWA; also called the Fourier Modal Method (FMM)) and the S-matrix algorithm. S4 was developed by Victor Liu of the Fan Group in the Stanford Electrical Engineering Department.
+
diff --git a/s4.spec b/s4.spec
new file mode 100644
index 0000000..d729b92
--- /dev/null
+++ b/s4.spec
@@ -0,0 +1,64 @@
+Name:          s4
+Version:       20131116git
+Release:       1mamba
+Summary:       Stanford Stratified Structure Solver - Electromagnetic simulator for layered periodic structures
+Group:         Applications/Scientific
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           http://www.stanford.edu/group/fan/S4/
+## GITSOURCE https://github.com/victorliu/S4.git master
+Source:        https://github.com/victorliu/S4.git/master/S4-%{version}.tar.bz2
+License:       GPL
+## AUTOBUILDREQ-BEGIN
+BuildRequires: gcc-fortran
+BuildRequires: glibc-devel
+BuildRequires: libatlas-3dnow-devel
+BuildRequires: libblas-devel
+BuildRequires: libfftw-devel
+BuildRequires: libgcc
+BuildRequires: liblua-devel
+BuildRequires: libquadmath-devel
+BuildRequires: libstdc++6-devel
+## AUTOBUILDREQ-END
+BuildRoot:     %{_tmppath}/%{name}-%{version}-root
+
+%description
+S4 is a frequency domain code to solve layered periodic structures. Internally, it uses Rigorous Coupled Wave Analysis (RCWA; also called the Fourier Modal Method (FMM)) and the S-matrix algorithm. S4 was developed by Victor Liu of the Fan Group in the Stanford Electrical Engineering Department.
+
+%debug_package
+
+%prep
+%setup -q -n S4-%{version}
+chmod +x configure
+
+%build
+aclocal
+autoconf
+automake
+%configure
+%make
+
+%install
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+%makeinstall
+
+%clean
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+%files
+%defattr(-,root,root)
+%{_bindir}/S4
+%dir %{_docdir}/S4
+%{_docdir}/S4/*.html
+%{_docdir}/S4/s4.css
+%{_docdir}/S4/s4.png
+%dir %{_docdir}/S4/examples
+%{_docdir}/S4/examples/*
+%{_mandir}/man1/S4.1.gz
+%doc AUTHORS COPYING
+#%doc ChangeLog README TODO
+
+%changelog
+* Sat Nov 16 2013 Silvan Calarco <silvan.calarco@mambasoft.it> 20131116git-1mamba
+- package created by silvan using the webbuild interface