diff --git a/docs/grub.texi b/docs/grub.texi
index 1127c86f0..54b0e17ae 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -6200,6 +6200,7 @@ Required files are:
 
 @menu
 * GRUB only offers a rescue shell::
+* Firmware stalls instead of booting GRUB::
 @end menu
 
 
@@ -6270,6 +6271,17 @@ support has not yet been added to GRUB.
 @end itemize
 
 
+@node Firmware stalls instead of booting GRUB
+@section Firmware stalls instead of booting GRUB
+
+The EFI implementation of some older MacBook laptops stalls when it gets
+presented a grub-mkrescue ISO image for x86_64-efi target on an USB stick.
+Affected are models of year 2010 or earlier. Workaround is to zeroize the
+bytes 446 to 461 of the EFI partition, where mformat has put a partition table
+entry which claims partition start at block 0. This change will not hamper
+bootability on other machines.
+
+
 @node Invoking grub-install
 @chapter Invoking grub-install