Refine the previous comment about ssh-keygen
diff --git a/guide/locations/_ssh-keys.md b/guide/locations/_ssh-keys.md
index d087922..adebcba 100644
--- a/guide/locations/_ssh-keys.md
+++ b/guide/locations/_ssh-keys.md
@@ -26,13 +26,15 @@
$ ssh-keygen -t rsa -N "" -m PEM -f ~/.ssh/id_rsa
```
-**Note:** For previous versions of OpenSSL, the `-m PEM` flag is not necessary.
-However, for newer versions of OpenSSL, if the `-m PEM` flag is omitted, the
-key produced will be in OPENSSL format, not RSA format. To determine if a key
-is in the correct format, `cat` the key and the first line should read as follows:
+**Note:** For previous versions of OpenSSH, the `-m PEM` flag is not necessary.
+However, for newer versions of OpenSSH, if the `-m PEM` flag is omitted, the
+generated key will be in RFC4716 format, not PEM format. Check the first line of
+the generated secret key file, which should be as follows:
```bash
+$ head -n 1 ~/.ssh/id_rsa
-----BEGIN RSA PRIVATE KEY-----
+$
```
