diff --git a/deltachat-ffi/README.md b/deltachat-ffi/README.md
index d924fb795..41084f344 100644
--- a/deltachat-ffi/README.md
+++ b/deltachat-ffi/README.md
@@ -1 +1,10 @@
 # Delta Chat C Interface
+
+## Documentation
+
+To generate the C Interface documentation,
+call doxygen in the `deltachat-ffi` directory
+and browse the `html` subdirectory.
+
+If thinks work,
+the documentation is also available online at <https://c.delta.chat>