diff --git a/README.md b/README.md
index d8f698e..5d1e679 100644
--- a/README.md
+++ b/README.md
@@ -7,3 +7,8 @@
 - LDAP
 - oauth2/OpenID
 - icinga
+
+Raspberry pi as soundcard
+- gadget mode
+- OTG g_audio
+- https://audiosciencereview.com/forum/index.php?threads/raspberry-pi-as-usb-to-i2s-adapter.8567/post-215824