diff --git a/README.md b/README.md
index cfe9e8f..f666e4e 100644
--- a/README.md
+++ b/README.md
@@ -18,9 +18,9 @@ XOPP to OML converter
 
 Dependencies: Python3, Jinja2, xopp2py
 
-#### Entry point: xopp2oml.convert
+Entry point: xopp2oml.convert (Python script that takes as input as .xopp file and produces as output an .oml file)
 
-Python script that takes as input as .xopp file and produces as output an .oml file.
+See also: [src/xopp2oml/README.md](src/xopp2oml/README.md)
 
 
 ## Running the tests
diff --git a/src/xopp2oml/README.md b/src/xopp2oml/README.md
new file mode 100644
index 0000000..34a1eed
--- /dev/null
+++ b/src/xopp2oml/README.md
@@ -0,0 +1,5 @@
+# xopp2oml - OML exporter for xopp2py
+
+This exporter generates OML descriptions that use the following vocabulary:
+
+https://msdl.uantwerpen.be/git/lucasalbertins/DTDesign/src/d070f9e9e932ad9910eaab92eabc368e7ee96058/examples/oml/CDF/src/oml/flandersmake.be/cdf/vocabulary/xopp.oml
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