diff --git a/include/linux/init.h b/include/linux/init.h
index 6b951095a42f606e8d48fa948047bfaaf6771c4f..5e664f671615d9615421ed40444aac1550d36fa2 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -191,6 +191,7 @@ extern bool initcall_debug;
  * initializes variables that couldn't be statically initialized.
  *
  * This only exists for built-in code, not for modules.
+ * Keep main.c:initcall_level_names[] in sync.
  */
 #define pure_initcall(fn)		__define_initcall("0",fn,0)
 
@@ -280,7 +281,7 @@ void __init parse_early_options(char *cmdline);
 
 #else /* MODULE */
 
-/* Don't use these in modules, but some people do... */
+/* Don't use these in loadable modules, but some people do... */
 #define early_initcall(fn)		module_init(fn)
 #define core_initcall(fn)		module_init(fn)
 #define postcore_initcall(fn)		module_init(fn)
diff --git a/init/main.c b/init/main.c
index b5cc0a7c4708f167925aa1f974eb356f99de1ebc..7a740870ffe398451359969ee8069b8e6050c521 100644
--- a/init/main.c
+++ b/init/main.c
@@ -724,6 +724,7 @@ static initcall_t *initcall_levels[] __initdata = {
 	__initcall_end,
 };
 
+/* Keep these in sync with initcalls in include/linux/init.h */
 static char *initcall_level_names[] __initdata = {
 	"early",
 	"core",