diff --git a/src/main/java/spoon/Metamodel.java b/src/main/java/spoon/Metamodel.java
index 622b0721d56..7bda0513a56 100644
--- a/src/main/java/spoon/Metamodel.java
+++ b/src/main/java/spoon/Metamodel.java
@@ -359,6 +359,13 @@ public String toString() {
 	}
 
 	private interface FieldMaker {
+		/**
+		 * Creates a instance of Field in Type
+		 * @param role a role of the {@link Field}
+		 * @param derived marker if field is derived
+		 * @param unsettable marker if field is unsettable
+		 * @return this to support fluent API
+		 */
 		FieldMaker field(CtRole role, boolean derived, boolean unsettable);
 	}