diff --git a/ot/utils.py b/ot/utils.py
index 1f24fa33f..a56782364 100644
--- a/ot/utils.py
+++ b/ot/utils.py
@@ -140,7 +140,7 @@ def projection_sparse_simplex(V, max_nz, z=1, axis=None, nx=None):
     r"""Projection of :math:`\mathbf{V}` onto the simplex with cardinality constraint (maximum number of non-zero elements) and then scaled by `z`.
 
     .. math::
-        P\left(\mathbf{V}, max_nz, z\right) = \mathop{\arg \min}_{\substack{\mathbf{y} >= 0 \\ \sum_i \mathbf{y}_i = z} \\ ||p||_0 \le \text{max_nz}} \quad \|\mathbf{y} - \mathbf{V}\|^2
+        P\left(\mathbf{V}, \text{max_nz}, z\right) = \mathop{\arg \min}_{\substack{\mathbf{y} >= 0 \\ \sum_i \mathbf{y}_i = z} \\ ||p||_0 \le \text{max_nz}} \quad \|\mathbf{y} - \mathbf{V}\|^2
 
     Parameters
     ----------