Improve doc of special math functions

1 files changed, 6 insertions, 1 deletions

diff --git a/Eigen/src/plugins/ArrayCwiseBinaryOps.h b/Eigen/src/plugins/ArrayCwiseBinaryOps.h
index 99f4048d7..c3f8c2575 100644
--- a/Eigen/src/plugins/ArrayCwiseBinaryOps.h
+++ b/Eigen/src/plugins/ArrayCwiseBinaryOps.h
@@ -317,13 +317,18 @@ polygamma(const EIGEN_CURRENT_STORAGE_BASE_CLASS<DerivedN> &n) const
 }
 #endif
 
-/** \cpp11 \returns an expression of the coefficient-wise zeta function.
+/** \returns an expression of the coefficient-wise zeta function.
   *
   * It returns the Riemann zeta function of two arguments \c *this and \a q:
   *
   * \param *this is the exposent, it must be > 1
   * \param q is the shift, it must be > 0
   *
+  * \note This function supports only float and double scalar types. To support other scalar types, the user has
+  * to provide implementations of zeta(T,T) for any scalar type T to be supported.
+  *
+  * This method is an alias for zeta(*this,q);
+  *
   * \sa Eigen::zeta()
   */
 template<typename DerivedQ>