diff --git a/README.md b/README.md
index 060c93a..1bc0794 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # ocaml-csexp
 
+This project provides minimal support for parsing and printing S-expressions in canonical form, which is a very simple and canonical binary encoding of S-expressions.
+
diff --git a/ocaml-csexp.spec b/ocaml-csexp.spec
new file mode 100644
index 0000000..a256ea9
--- /dev/null
+++ b/ocaml-csexp.spec
@@ -0,0 +1,46 @@
+Name:          ocaml-csexp
+Version:       1.5.1
+Release:       1mamba
+Summary:       Csexp - Canonical S-expressions
+Group:         System/Libraries
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           https://github.com/ocaml-dune/csexp
+Source:        https://github.com/ocaml-dune/csexp.git/%{version}/csexp-%{version}.tar.bz2
+License:       MIT
+## AUTOBUILDREQ-BEGIN
+BuildRequires: glibc-devel
+BuildRequires: ocaml
+BuildRequires: ocaml-runtime
+## AUTOBUILDREQ-END
+BuildRequires: dune
+
+%description
+This project provides minimal support for parsing and printing S-expressions in canonical form, which is a very simple and canonical binary encoding of S-expressions.
+
+%debug_package
+
+%prep
+%setup -q -n csexp-%{version}
+
+%build
+dune build -p csexp
+
+%install
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+DESTDIR="%{buildroot}" dune install --prefix "%{_prefix}" --libdir "%{_lib}/ocaml"
+
+rm -r %{buildroot}/usr/doc
+
+%clean
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+%files
+%defattr(-,root,root)
+%dir %{_libdir}/ocaml/csexp
+%{_libdir}/ocaml/csexp/*
+
+%changelog
+* Tue May 04 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 1.5.1-1mamba
+- package created using the webbuild interface