diff --git a/README.md b/README.md
new file mode 100644
index 0000000..254df05
--- /dev/null
+++ b/README.md
@@ -0,0 +1,14 @@
+# Automated LuaLaTeX math to MathML conversion
+**Highly experimental! At this point all interfaces may change without prior warning and many features aren't implemented yet. It is not ready for anything beyond simple experiments.**
+
+This is an attempt to implement automatic conversion of LuaLaTeX inline and display math expressions into MathML code to aid with tagging.
+It works best with `unicode-math`, but it can also be used with traditional math fonts if mappings to Unicode are provided.
+
+## Installation
+Run `l3build install` to install `luamml` into your local `texmf` tree.
+
+## Demo
+Run `lualatex test_tex` to see all equations from [our example file](./test_tex.tex) converted into MathML. 
+
+To test it on your own files, add `\usepackage{luamml}` and `\tracingmathml=2` to your preamble.
+Also see a [`tagpdf` experiment using this to tag PDF formulas](https://github.com/u-fischer/tagpdf/blob/develop/experiments/exp-mathml-lua.tex).
diff --git a/test_tex.tex b/test_tex.tex
index 8a00fc5..55c341a 100644
--- a/test_tex.tex
+++ b/test_tex.tex
@@ -1,22 +1,34 @@
 \documentclass{article}
-% \usepackage{unicode-math}
-\usepackage{amsmath}
 \usepackage{luamml}
-\RegisterFamilyMapping\symsymbols{oms}
-\RegisterFamilyMapping\symletters{oml}
-\RegisterFamilyMapping\symlargesymbols{omx}
+\usepackage{amsmath,array}
+
+\usepackage{unicode-math}
+%% Uncomment the following lines when used without unicode-math
+% \RegisterFamilyMapping\symsymbols{oms}
+% \RegisterFamilyMapping\symletters{oml}
+% \RegisterFamilyMapping\symlargesymbols{omx}
+
 \ExplSyntaxOn
-\tracingmathml2
-\pdfvariable compresslevel0
+\tracingmathml=2
+\pdfvariable compresslevel=0
 \cs_new_protected:Npn \ShowMathMLObj {
   \message { \luamml_get_last_mathml_stream:e{}~0~R }
 }
 \ExplSyntaxOff
+
 \begin{document}
 \[
-  ax^2+bx+c=0
+  \begin{pmatrix}
+    1 & 0 & 0 \\
+    0 & 1 & 0 \\
+    0 & 0 & 1
+  \end{pmatrix}
+  =
+  \begin{cases}
+    1 & $if $a=b\\
+    2 & $else$
+  \end{cases}
 \]
-\ShowMathMLObj
 \[
   x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}.
 \]
@@ -29,7 +41,6 @@
   1+2&=3\\
   5
 \end{align}
-\ShowMathMLObj
 
 Es gilt $\sin(x)-\sin(x+2\pi)=0$.
 \end{document}