@@ -1,5 +1,14 @@
-/* Common header file that is included by all of qemu. */
+/* Common header file that is included by all of QEMU.
+ * This file is supposed to be included only by .c files. No header file should
+ * depend on qemu-common.h, as this would easily lead to circular header
+ * dependencies.
+ * If a header file uses a definition from qemu-common.h, that definition
+ * must be moved to a separate header file, and the header that uses it
+ * must include that header.