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diff --git a/src/libnoiseforjava/module/Checkerboard.java b/src/libnoiseforjava/module/Checkerboard.java
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+++ b/src/libnoiseforjava/module/Checkerboard.java
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+/*
+ * Copyright (C) 2003, 2004 Jason Bevins (original libnoise code)
+ * Copyright  2010 Thomas J. Hodge (java port of libnoise)
+ * 
+ * This file is part of libnoiseforjava.
+ * 
+ * libnoiseforjava is a Java port of the C++ library libnoise, which may be found at 
+ * http://libnoise.sourceforge.net/.  libnoise was developed by Jason Bevins, who may be 
+ * contacted at [email protected] (for great email, take off every 'zig').
+ * Porting to Java was done by Thomas Hodge, who may be contacted at
+ * [email protected] (remove every 'zag').
+ * 
+ * libnoiseforjava is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ * 
+ * libnoiseforjava is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along with
+ * libnoiseforjava.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ */
+
+package libnoiseforjava.module;
+
+import libnoiseforjava.NoiseGen;
+
+public class Checkerboard extends ModuleBase
+{
+   /// Noise module that outputs a checkerboard pattern.
+   ///
+   /// This noise module outputs unit-sized blocks of alternating values.
+   /// The values of these blocks alternate between -1.0 and +1.0.
+   ///
+   /// This noise module is not really useful by itself, but it is often used
+   /// for debugging purposes.
+   ///
+   /// This noise module does not require any source modules.
+
+   public Checkerboard()    
+   {
+      super(0);
+   }
+
+   public double getValue (double x, double y, double z)
+   {
+      int ix = (int)(Math.floor(NoiseGen.MakeInt32Range (x)));
+      int iy = (int)(Math.floor(NoiseGen.MakeInt32Range (y)));
+      int iz = (int)(Math.floor(NoiseGen.MakeInt32Range (z)));
+
+      // original was 
+      //(ix & 1 ^ iy & 1 ^ iz & 1)
+      // not certain if this duplicates it or not
+      if ((ix%2 == 1) ^ (iy%2 ==  1) ^ (iz%2 == 1))
+         return -1.0;
+      else
+         return 1.0;
+   }
+}
+