diff --git a/acinclude.m4 b/acinclude.m4
index 4f9c0a161..c930444a3 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -533,7 +533,7 @@ dnl Declare file $1 to be a script that needs configuring,
 dnl and arrange to make it executable in the process.
 AC_DEFUN([GUILE_CONFIG_SCRIPT],[AC_CONFIG_FILES([$1],[chmod +x $1])])
 
-# clock_time.m4 serial 10
+
 dnl Copyright (C) 2002-2006, 2009-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
diff --git a/configure.ac b/configure.ac
index 021199601..a531faa5f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -68,7 +68,9 @@ dnl Gnulib.
 gl_INIT
 dnl FIXME: remove me and the acinclude.m4 code when clock-gettime is
 dnl fixed for clock_getcpuclockid and can be imported normally from
-dnl gnulib.
+dnl gnulib.  See
+dnl <http://lists.gnu.org/archive/html/bug-gnulib/2011-06/msg00227.html>
+dnl for details.
 gl_CLOCK_TIME
 
 AC_PROG_CC_C89