diff --git a/stim/cuda/kmeans.cuh b/stim/cuda/kmeans.cuh
index f5a56bd..3263bc3 100644
--- a/stim/cuda/kmeans.cuh
+++ b/stim/cuda/kmeans.cuh
@@ -1,3 +1,16 @@
+//This software is dervied from Professor Wei-keng Liao's parallel k-means
+//clustering code obtained on November 21, 2010 from
+// http://users.eecs.northwestern.edu/~wkliao/Kmeans/index.html
+//(http://users.eecs.northwestern.edu/~wkliao/Kmeans/simple_kmeans.tar.gz).
+//
+//With his permission, Serban Giuroiu is publishing his CUDA implementation based on his code
+//under the open-source MIT license. See the LICENSE file for more details.
+
+// The original code can be found on Github ( https://github.com/serban/kmeans )
+// Here I have just made a few changes to get it to work
+
+
+
 
 #define malloc2D(name, xDim, yDim, type) do {               \
     name = (type **)malloc(xDim * sizeof(type *));          \
--
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