Explain what is supposed to be in starpu_config.h

include/starpu_config.h.in

@@ -15,6 +15,13 @@
  * See the GNU Lesser General Public License in COPYING.LGPL for more details.
  */
 
+/*
+ * This is the public config.h file, installed along libstarpu.
+ *
+ * It should only contain the build-time #defines which have an effect on the
+ * API & ABI.
+ */
+
 #ifndef __STARPU_CONFIG_PUBLIC_H__
 #define __STARPU_CONFIG_PUBLIC_H__