diff --git a/README.md b/README.md
index d194ce8..242d8ae 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,8 @@
 # swift-secure-enclave-tool-rs
 
+> Specification: https://openwebstandard.org/rfc1
+
+<br>
+
 > Reference: https://git.hatter.ink/hatter/swift-secure-enclave-tool