diff --git a/doc/src/compute_contact_atom.rst b/doc/src/compute_contact_atom.rst
index 8e94460877..384ede290f 100644
--- a/doc/src/compute_contact_atom.rst
+++ b/doc/src/compute_contact_atom.rst
@@ -50,9 +50,6 @@ overview of LAMMPS output options.
 The per-atom vector values will be a number :math:`\ge 0.0`, as explained
 above.
 
-The optional *group2-ID* argument allows to specify from which group atoms
-contribute to the coordination number. Default setting is group 'all.'
-
 Restrictions
 """"""""""""