diff --git a/README.md b/README.md
index 9e4b1bdb..0df77a48 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,10 @@
 
 Matrix SDK for the famedly talk app written in dart.
 
+## Native libraries
+
+For E2EE, libolm must be provided (see https://pub.dev/packages/olm#using-dart-olm).
+
 ## API
 
 The API is documented here: [famedly.gitlab.io/famedlysdk/](https://famedly.gitlab.io/famedlysdk/)