diff --git a/docs/source/usage/python.rst b/docs/source/usage/python.rst
index ab517ed6e..e56deaec4 100644
--- a/docs/source/usage/python.rst
+++ b/docs/source/usage/python.rst
@@ -753,7 +753,7 @@ This module provides elements for the accelerator lattice.
    :param phase: RF driven phase in degrees
    :param cos_coefficients: array of ``float`` cosine coefficients in Fourier expansion of on-axis electric field Ez (optional); default is a 9-cell TESLA superconducting cavity model from `DOI:10.1103/PhysRevSTAB.3.092001 <https://doi.org/10.1103/PhysRevSTAB.3.092001>`__
 
-   :param cos_coefficients: array of ``float`` sine coefficients in Fourier expansion of on-axis electric field Ez (optional); default is a 9-cell TESLA superconducting cavity model from `DOI:10.1103/PhysRevSTAB.3.092001 <https://doi.org/10.1103/PhysRevSTAB.3.092001>`__
+   :param sin_coefficients: array of ``float`` sine coefficients in Fourier expansion of on-axis electric field Ez (optional); default is a 9-cell TESLA superconducting cavity model from `DOI:10.1103/PhysRevSTAB.3.092001 <https://doi.org/10.1103/PhysRevSTAB.3.092001>`__
    :param dx: horizontal translation error in m
    :param dy: vertical translation error in m
    :param rotation: rotation error in the transverse plane [degrees]