diff --git a/topics/oidc/java/java-adapter-config.adoc b/topics/oidc/java/java-adapter-config.adoc
index b371d7d966..e2c0e6489f 100644
--- a/topics/oidc/java/java-adapter-config.adoc
+++ b/topics/oidc/java/java-adapter-config.adoc
@@ -37,6 +37,7 @@ This is what one might look like:
 ----
 
 You can use `${...}` enclosure for system property replacement. For example `${jboss.server.config.dir}` would be replaced by `/path/to/{{book.project.name}}`.
+Replacement of environment variables is also supported via the `env` prefix, e.g. `${env.MY_ENVIRONMENT_VARIABLE}`. 
 
 The initial config file can be obtained from the the admin console. This can be done by opening the admin console, select `Clients` from the menu and clicking
 on the corresponding client. Once the page for the client is opened click on the `Installation` tab and select `Keycloak OIDC JSON`.