diff --git a/03-getting-started/03-configuration-and-env.adoc b/03-getting-started/03-configuration-and-env.adoc
index 988f61f..260dcb3 100644
--- a/03-getting-started/03-configuration-and-env.adoc
+++ b/03-getting-started/03-configuration-and-env.adoc
@@ -51,6 +51,13 @@ Config.get('database.mysql.host')
 Config.get('database.mysql.host', '127.0.0.1')
 ----
 
+Also you can update the in-memory config value for a key as shown below.
+
+[source, js]
+----
+Config.set('database.mysql.host', 'db.example.com')
+----
+
 == Environment variables
 Quite often you want to have a different configuration based upon the environment your code is running in. For example: Using *sandbox secrets* for a 3rd party service in development.