diff --git a/INSTALL.BZR b/INSTALL.BZR
index c5e1e62a32d..a3bbd2dd69b 100644
--- a/INSTALL.BZR
+++ b/INSTALL.BZR
@@ -9,6 +9,10 @@ before bootstrapping:
 
   $ ./configure
 
+(Note that normally there is no need to run `autoconf' etc.  If you
+need it, the relevant command is `autoreconf -I m4'.  Be aware that
+this will likely lead to conflicts next time you update from Bazaar.)
+
 Some of the files that are included in the Emacs tarball, such as
 byte-compiled Lisp files, are not stored in Bazaar.  Therefore, to
 build from Bazaar you must run "make bootstrap" instead of just "make":