diff --git a/configure.ac b/configure.ac
index e17d255..d9f3253 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,12 @@
+dnl
+dnl Process this file with autoconf to create configure.
+
+# Initialize Autoconf
 AC_PREREQ([2.60])
 AC_INIT([XineramaProto], [1.2], [https://bugs.freedesktop.org/enter_bug.cgi?product=xorg])
+AC_CONFIG_SRCDIR([Makefile.am])
+
+# Initialize Automake
 AM_INIT_AUTOMAKE([foreign dist-bzip2])
 AM_MAINTAINER_MODE