update README.md

README.md

@@ -7,3 +7,17 @@ Run it via `make test`.
 different programs then check whether versions are greater than, equal or less
 than one another and output >, = and <, respectively in order. It is then
 checked whether the output of all implementations is the same.
+
+Currently, this checks the libdpkg C implementation, libapt and dose3.
+
+Additionally, the following parsers could be added:
+
+ - libdpkg-perl
+ - libben-ocaml (in lib/benl_base.ml and lib/benl_dpkg.c)
+
+The following do not use their own parser:
+
+ - python-debian uses python-apt
+ - libghc-dpkg-dev uses libdpkg-dev
+ - ruby-debian uses libapt-pkg-dev
+ - dpkg-dev-el uses `dpkg --compare-versions`