diff --git a/engine/security/certificates.md b/engine/security/certificates.md
index 94d49b55e9..9004f335f3 100644
--- a/engine/security/certificates.md
+++ b/engine/security/certificates.md
@@ -38,7 +38,7 @@ The following illustrates a configuration with multiple certs:
 
 ```
     /etc/docker/certs.d/        <-- Certificate directory
-    └── localhost               <-- Hostname
+    └── localhost:5000          <-- Hostname:port
        ├── client.cert          <-- Client certificate
        ├── client.key           <-- Client key
        └── localhost.crt        <-- Certificate authority that signed
@@ -77,4 +77,4 @@ Missing key KEY_NAME for client certificate CERT_NAME. Note that CA certificates
 ## Related Information
 
 * [Use trusted images](index.md)
-* [Protect the Docker daemon socket](https.md)
\ No newline at end of file
+* [Protect the Docker daemon socket](https.md)