diff --git a/core/network/src/main/kotlin/com/google/samples/apps/nowinandroid/core/network/demo/DemoAssetManager.kt b/core/network/src/main/kotlin/com/google/samples/apps/nowinandroid/core/network/demo/DemoAssetManager.kt
index e5fb07bb3..d3264a251 100644
--- a/core/network/src/main/kotlin/com/google/samples/apps/nowinandroid/core/network/demo/DemoAssetManager.kt
+++ b/core/network/src/main/kotlin/com/google/samples/apps/nowinandroid/core/network/demo/DemoAssetManager.kt
@@ -18,6 +18,7 @@ package com.google.samples.apps.nowinandroid.core.network.demo
 
 import java.io.InputStream
 
-fun interface DemoAssetManager {
+interface DemoAssetManager {
     fun open(fileName: String): InputStream
+    fun readText(fileName: String): String
 }