diff --git a/hgext/patchbomb.py b/hgext/patchbomb.py
--- a/hgext/patchbomb.py
+++ b/hgext/patchbomb.py
@@ -20,7 +20,7 @@ message contains two or three body parts
 
   The patch itself, as generated by "hg export".
 
-Each message refers to all of its predecessors using the In-Reply-To
+Each message refers to the first in the series using the In-Reply-To
 and References headers, so they will show up as a sequence in threaded
 mail and news readers, and in mail archives.