diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index eb5861bb21d..5e4c11d5cfb 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,8 @@
+2013-09-07  Roland Winkler  <winkler@gnu.org>
+
+	* textmodes/bibtex.el (bibtex-biblatex-entry-alist): Add optional
+	field subtitle for entry type book.
+
 2013-09-06  Stefan Monnier  <monnier@iro.umontreal.ca>
 
 	* minibuffer.el: Make minibuffer-complete call completion-in-region
diff --git a/lisp/textmodes/bibtex.el b/lisp/textmodes/bibtex.el
index 171f373317a..795c04e31e1 100644
--- a/lisp/textmodes/bibtex.el
+++ b/lisp/textmodes/bibtex.el
@@ -468,7 +468,7 @@ alternatives, starting from zero."
      nil
      (("editor") ("editora") ("editorb") ("editorc")
       ("translator") ("annotator") ("commentator")
-      ("introduction") ("foreword") ("afterword") ("titleaddon")
+      ("introduction") ("foreword") ("afterword") ("subtitle") ("titleaddon")
       ("maintitle") ("mainsubtitle") ("maintitleaddon")
       ("language") ("origlanguage") ("volume") ("part") ("edition") ("volumes")
       ("series") ("number") ("note") ("publisher") ("location") ("isbn")