diff --git a/src/operator/numpy/linalg/np_gesvd-inl.h b/src/operator/numpy/linalg/np_gesvd-inl.h
index cbe65e2297ce..efcc65ae3f47 100644
--- a/src/operator/numpy/linalg/np_gesvd-inl.h
+++ b/src/operator/numpy/linalg/np_gesvd-inl.h
@@ -111,7 +111,9 @@ void NumpyLaGesvdForward(const nnvm::NodeAttrs& attrs,
   });
 }
 
-// Helper for gesvd_backward. See technical report for details
+// Helper for gesvd_backward. See technical report
+// `Auto-Differentiating Linear Algebra` for details
+// on https://arxiv.org/pdf/1710.08717.pdf
 template<typename DType>
 DType gesvd_back_helper_eps(DType* X);