diff --git a/pippo-controller-parent/pippo-controller/src/main/java/ro/pippo/controller/extractor/MethodParameterExtractor.java b/pippo-controller-parent/pippo-controller/src/main/java/ro/pippo/controller/extractor/MethodParameterExtractor.java
index 1d5cfe4d..b55d9cb7 100644
--- a/pippo-controller-parent/pippo-controller/src/main/java/ro/pippo/controller/extractor/MethodParameterExtractor.java
+++ b/pippo-controller-parent/pippo-controller/src/main/java/ro/pippo/controller/extractor/MethodParameterExtractor.java
@@ -20,6 +20,7 @@
 
 /**
  * Interface that defines a method parameter extractor.
+ * This interface is implemented by all method parameter extractors.
  *
  * @author Decebal Suiu
  * @author James Moger