diff --git a/examples/valueSubstitution/app.d b/examples/valueSubstitution/app.d
index 81521e7..82b6f89 100644
--- a/examples/valueSubstitution/app.d
+++ b/examples/valueSubstitution/app.d
@@ -16,8 +16,9 @@ void main() {
     // This example shows how values in configuration can be substituted from
     // environment variables or other configuration paths.
 
-    environment["subject"] = "world";
+    environment["CONFIG_EXAMPLE_SUBJECT"] = "world";
     auto config = loadJsonConfig("config.json");
 
-    writeln(config.get("greeting"));
+    writeln(config.get("start")); // "Hello world! Enjoy your day!"
+    writeln(config.get("end"));   // "Bye!"
 }
diff --git a/examples/valueSubstitution/config.json b/examples/valueSubstitution/config.json
index e570a9f..8fe7f60 100644
--- a/examples/valueSubstitution/config.json
+++ b/examples/valueSubstitution/config.json
@@ -4,5 +4,6 @@
     "subject": "$CONFIG_EXAMPLE_SUBJECT",
     "followUp": "${CONFIG_EXAMPLE_FOLLOW_UP:Enjoy your day!}"
   },
-  "greeting": "${parameters.greeting} ${parameters.subject}! ${parameters.followUp}"
+  "start": "${parameters.greeting} ${parameters.subject}! ${parameters.followUp}",
+  "end": "${parameters.farewell:Bye!}"
 }