diff --git a/doerg/doerg-temml-worker/README.org b/doerg/doerg-temml-worker/README.org
index c2d5bd4..1789a11 100644
--- a/doerg/doerg-temml-worker/README.org
+++ b/doerg/doerg-temml-worker/README.org
@@ -1 +1,12 @@
 #+title: doerg-temml-worker
+
+This is a tiny Node script that is used by doerg. For each CBOR-encoded value on stdin (a "command"), a response value is spit to stdout.
+
+Currently, the following commands are supported:
+- Any string: Return the Temml-rendered MathML code as a string (inline).
+- An array with a single string element: Return the Temml-rendered MathML code as a string (display).
+If something goes wrong, either of these commands may return an object of form
+#+begin_src json
+  {"type": "error"
+  ,"error": «error object»}
+#+end_src