diff --git a/src/test/java/eg/components/Tee.java b/src/test/java/eg/components/Tee.java
index 98a7ac9..f2bf093 100644
--- a/src/test/java/eg/components/Tee.java
+++ b/src/test/java/eg/components/Tee.java
@@ -18,6 +18,9 @@
 
 package eg.components;
 
+/**
+ * Simple interface from the examples that exposes a string accessor.
+ */
 interface Tee {
     String getS();
 }