diff --git a/rtmp/amf.go b/rtmp/amf.go
index 1977254c..c0212c5f 100644
--- a/rtmp/amf.go
+++ b/rtmp/amf.go
@@ -3,7 +3,8 @@ NAME
   amf.go
 
 DESCRIPTION
-  RMTP encoding/decoding functions.
+  Action Message Format (AMF) encoding/decoding functions.
+  See https://en.wikipedia.org/wiki/Action_Message_Format.
 
 AUTHORS
   Saxon Nelson-Milton <saxon@ausocean.org>