diff --git a/chess-java-interface/src/main/java/net/hypki/wmi/oop/chess/ChessInterface.java b/chess-java-interface/src/main/java/net/hypki/wmi/oop/chess/ChessInterface.java
index d761246..e65aada 100644
--- a/chess-java-interface/src/main/java/net/hypki/wmi/oop/chess/ChessInterface.java
+++ b/chess-java-interface/src/main/java/net/hypki/wmi/oop/chess/ChessInterface.java
@@ -5,6 +5,11 @@ package net.hypki.wmi.oop.chess;
  *
  */
 public interface ChessInterface {
+	/**
+	 * 
+	 * @param opponentMove - it is a simple from-to format (e.g. e2-e4)
+	 * @return
+	 */
 	public String nextMove(String opponentMove);
 	
 	public void printBoard();