diff --git a/kwant/solvers/common.py b/kwant/solvers/common.py
index 6abd9607d72949c95dd29a9a53bf04ad675413b6..218734bc3989476dda004aab775bf7d0b3500f61 100644
--- a/kwant/solvers/common.py
+++ b/kwant/solvers/common.py
@@ -119,7 +119,7 @@ class SparseSolver(object):
         Returns
         -------
         (lhs, rhs, indices, num_orb) : LinearSys
-            `lhs` is a numpy.sparse.csc_matrix, containing the left hand side
+            `lhs` is a scipy.sparse.csc_matrix, containing the left hand side
             of the system of equations.  `rhs` is a list of matrices with the
             right hand side, with each matrix corresponding to one lead
             mentioned in `in_leads`. `indices` is a list of arrays of variables