--- a/emacs.rst	Tue Oct 27 14:49:39 2009 +0200
+++ b/emacs.rst	Wed Nov 04 19:53:55 2009 +0200
@@ -64,6 +64,12 @@
 error 'No error until here' when reloading the file, move the expression
 towards the back of the file, otherwise towards the front of the file.
 
+** Call tree.
+
+Before byte compiling file execute
+
+  (setq byte-compile-generate-call-tree t)
+
 * WWW.
 
 ** Text based WWW browser.