diff --git a/include/armadillo_bits/gmm_full_meat.hpp b/include/armadillo_bits/gmm_full_meat.hpp
index b81c823c..6a177cf8 100644
--- a/include/armadillo_bits/gmm_full_meat.hpp
+++ b/include/armadillo_bits/gmm_full_meat.hpp
@@ -937,7 +937,7 @@ gmm_full<eT>::init_constants(const bool calc_chol)
           Mat<eT>& inv_fcov =  inv_fcovs.slice(g);
     
   //const bool inv_ok = auxlib::inv(tmp_inv, fcov);
-    const bool inv_ok = auxlib::inv_sympd(tmp_inv, fcov);
+    const bool inv_ok = auxlib::inv_sympd(tmp_inv, fcov);  // using inv_sympd() instead of inv() to ensure we can do cholesky decomp via op_chol
     
     eT log_det_val  = eT(0);
     eT log_det_sign = eT(0);