diff --git a/src/sycl_comp.cpp b/src/sycl_comp.cpp
index 6263b99..420c7fa 100644
--- a/src/sycl_comp.cpp
+++ b/src/sycl_comp.cpp
@@ -132,7 +132,11 @@ auto matrixMultTransposeSYCL(sycl::queue &q, const Matrix<data_type> &matA,
   return matRes.chksum();
 }
 
-/* Obtains the previous power of two from the given integer.
+/*
+ * Obtained from
+ * https://github.com/codeplaysoftware/computecpp-sdk/blob/master/samples/matrix-multiply.cpp
+ *
+ * Obtains the previous power of two from the given integer.
  * It works by masking out all ones after the first one bit,
  * then leaves the first one bit intact, effectively
  * yielding the first power of two < x. */