diff --git a/doc/documentation.rst b/doc/documentation.rst
index ccaea38d..3272b6f2 100644
--- a/doc/documentation.rst
+++ b/doc/documentation.rst
@@ -71,6 +71,7 @@ This is the reference manual for the python routines.
    sumk_dft_tools
    symmetry
    trans_basis
+   util
 
 
 
diff --git a/python/triqs_dft_tools/util.py b/python/triqs_dft_tools/util.py
index 59fc7cd7..701cd31f 100644
--- a/python/triqs_dft_tools/util.py
+++ b/python/triqs_dft_tools/util.py
@@ -18,6 +18,9 @@
 # TRIQS. If not, see <http://www.gnu.org/licenses/>.
 #
 ##########################################################################
+"""
+Helper utilities / standalone functions for the sumk class
+"""
 
 import numpy as np