diff --git a/README.md b/README.md
index 1bf9994d..c6b92b5b 100644
--- a/README.md
+++ b/README.md
@@ -127,3 +127,5 @@ fslongjin
 - ACPI_6_3_final_Jan30
 
 - the GNU GRUB manual
+
+- Intel® 64 and IA-32 Architectures Software Developer’s Manual
diff --git a/README_EN.md b/README_EN.md
index 5efeb959..61dd7b16 100644
--- a/README_EN.md
+++ b/README_EN.md
@@ -126,3 +126,5 @@ This project refers to the following materials. I sincerely give my thanks to th
 - ACPI_6_3_final_Jan30
 
 - the GNU GRUB manual
+
+- Intel® 64 and IA-32 Architectures Software Developer’s Manual