diff --git a/source/_docs/ecosystem/certificates/tls_self_signed_certificate.markdown b/source/_docs/ecosystem/certificates/tls_self_signed_certificate.markdown
index cbd111228d11..7926fedadcbc 100644
--- a/source/_docs/ecosystem/certificates/tls_self_signed_certificate.markdown
+++ b/source/_docs/ecosystem/certificates/tls_self_signed_certificate.markdown
@@ -23,9 +23,11 @@ Change to your Home Assistant [configuration directory](/getting-started/configu
 The certificate **must** be `.pem` extension.
 
 ```bash
-openssl req -sha256 -newkey rsa:4096 -nodes -keyout privkey.pem -x509 -days 730 -out fullchain.pem
+openssl req -sha256 -addext "subjectAltName = IP:X.X.X.X" -newkey rsa:4096 -nodes -keyout privkey.pem -x509 -days 730 -out fullchain.pem
 ```
 
+Where the `X.X.X.X` must be replaced with the IP address of your local machine running Home Assistant (e.g., `192.168.1.20`).
+
 For details about the parameters, please check the OpenSSL documentation. Provide the requested information during the generation process.
 
 At the end you will have two files called `privkey.pem` and `fullchain.pem`. The key and the certificate.