diff --git a/BTP.markdown b/BTP.markdown
index a8d1929..9cdeefe 100644
--- a/BTP.markdown
+++ b/BTP.markdown
@@ -117,3 +117,7 @@ The nonce for the frame body is NONCE_LEN bytes long, with the following format:
 * Remaining bits: Zero
 
 The final frame flag allows the recipient to detect the end of the stream without reading to EOF, which is not possible for all transports on all platforms.
+
+### Headless mode
+
+BTP may be used in headless mode by supplying an ephemeral key. A headless stream does not have a pseudo-random tag or stream header, just one or more frames encrypted and authenticated with the ephemeral key, as described above.