diff --git a/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/AuthRuntimeConfig.java b/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/AuthRuntimeConfig.java
index d7488408fae2a0..83e2f742844c10 100644
--- a/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/AuthRuntimeConfig.java
+++ b/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/AuthRuntimeConfig.java
@@ -30,7 +30,7 @@ public class AuthRuntimeConfig {
      * Use it only if the mTLS authentication mechanism is enabled with either
      * `quarkus.http.ssl.client-auth=required` or `quarkus.http.ssl.client-auth=request`.
      * <p/>
-     * Properties file is expected to have the `CN:role1,role,...,roleN` format.
+     * Properties file is expected to have the `CN=role1,role,...,roleN` format.
      */
     @ConfigItem
     public Optional<Path> certificateRoleProperties;