diff --git a/bootmain.c b/bootmain.c
index c891e1b0e0..5f9e51b3ec 100644
--- a/bootmain.c
+++ b/bootmain.c
@@ -1,9 +1,9 @@
 // Boot loader.
 // 
-// The BIOS loads boot sector (bootasm.S) from sector 1 of the disk
+// The BIOS loads boot sector (bootasm.S) from sector 0 of the disk
 // into memory and executes it.  The boot sector puts the processor
 // in 32-bit mode and calls bootmain below, which loads an ELF kernel
-// image from the disk starting at sector 2 and then jumps to the
+// image from the disk starting at sector 1 and then jumps to the
 // kernel entry routine.
 
 #include "types.h"