diff --git a/TODO b/TODO
index 1745b4462c5681c9e609e4bcc968613998402d6d..a82973f35f202efbfa3de0246ff9e81d1664e213 100644
--- a/TODO
+++ b/TODO
@@ -29,10 +29,12 @@ Next (in order of descending priority/precedence):
 	- Detect assignment of too large constant values to variables at runtime.
 	- Verify outgoing mail addresses at runtime when necessary
 	  (e.g. after variables substitution)
-	- Vacation: The ":subject" parameter specifies a subject line to attach to 
+	- Vacation: the ":subject" parameter specifies a subject line to attach to 
 	  any vacation response that is generated. UTF-8 characters can be used in
 	  the string argument; implementations MUST convert the string to [RFC2047]
  	  encoded words if and only if non-ASCII characters are present.
+	- Vacation: properly implement construction of a References header from
+	  the original message.
 * Imapflags: merge execution of setflags, removeflags and addflags into one 
   common implementation. 
 * Warn about the use of syntactically invalid header names.