diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -13,4 +13,8 @@ modified: 2024-05-13T14:28:52-05:00
 - https://osblog.stephenmarz.com/ch1.html
 - https://os.phil-opp.com/
 - https://github.com/skyzh/core-os-riscv
-- https://twilco.github.io/riscv-from-scratch/2019/04/27/riscv-from-scratch-2.html
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+- https://twilco.github.io/riscv-from-scratch/2019/04/27/riscv-from-scratch-2.html
+
+## RISC-V Spec
+https://riscv.org/wp-content/uploads/2019/12/riscv-spec-20191213.pdf
+https://riscv.org/wp-content/uploads/2019/08/riscv-privileged-20190608-1.pdf
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