diff --git a/README.md b/README.md
index 54c8c4b..36b174f 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,8 @@ cd audiotee
 swift run
 ```
 
+If you're not playing audio when you run it, you'll just see packets full of `AAAAA...` - the base64 encoding of zero.
+
 ## Build
 
 ```bash