diff --git a/docs/messaging.rst b/docs/messaging.rst
index 8d011d5ad..2cddf2338 100644
--- a/docs/messaging.rst
+++ b/docs/messaging.rst
@@ -86,7 +86,7 @@ are reasonably representable in JSON.
 General Message Format
 ======================
 
-A message is composed of four dictionaries.
+A message is composed of five dictionaries.
 
 Message Header
 --------------