diff --git a/docs/source/io_formats/statepoint.rst b/docs/source/io_formats/statepoint.rst
index 3a2ad1600e..92b103ef7f 100644
--- a/docs/source/io_formats/statepoint.rst
+++ b/docs/source/io_formats/statepoint.rst
@@ -52,9 +52,10 @@ The current version of the statepoint file format is 17.0.
              sum-of-squares for each global tally.
            - **source_bank** (Compound type) -- Source bank information for each
              particle. The compound type has fields ``r``, ``u``, ``E``,
-             ``wgt``, ``delayed_group``, and ``particle``, which represent the
-             position, direction, energy, weight, delayed group, and particle
-             type (0=neutron, 1=photon, 2=electron, 3=positron), respectively.
+             ``wgt``, ``delayed_group``, ``surf_id``, and ``particle``, which
+             represent the position, direction, energy, weight, delayed group,
+             surface ID, and particle type (0=neutron, 1=photon, 2=electron,
+             3=positron), respectively.
              Only present when `run_mode` is 'eigenvalue'.
 
 **/tallies/**