diff --git a/configure.in b/configure.in
index e4b3a4ec7fc..c30f5b456e9 100644
--- a/configure.in
+++ b/configure.in
@@ -3702,8 +3702,8 @@ test "${exec_prefix}" != NONE &&
   exec_prefix=`echo "${exec_prefix}" | sed 's,\([^/]\)/*$,\1,'`]
 
 dnl Obviously there is duplication here wrt $SUBDIR_MAKEFILES.
-dnl You _can_ use that variable here, so long as any directory using
-dnl automake (ie lib/) is explicitly listed and not "hidden" in a variable
+dnl You _can_ use that variable in AC_CONFIG_FILES, so long as any directory
+dnl using automake (ie lib/) is explicitly listed and not "hidden" in a variable
 dnl (else you get "no `Makefile.am' found for any configure output").
 dnl This will work, but you get a config.status that is not quite right
 dnl (see http://lists.gnu.org/archive/html/bug-autoconf/2008-08/msg00028.html).