diff --git a/README.md b/README.md
index ba5a6ca..73fe700 100644
--- a/README.md
+++ b/README.md
@@ -249,7 +249,7 @@ ssh -i id_user root@example.com
-> `external_*` subcommands follow <<Cryptography external command specification>>
+> `external_*` subcommands follow <<Cryptography external command specification>>
> Specification: https://openwebstandard.org/rfc1