diff --git a/workflow/scripts/gcmt_to_realisation.py b/workflow/scripts/gcmt_to_realisation.py
index aa93a77d..0f082f9b 100644
--- a/workflow/scripts/gcmt_to_realisation.py
+++ b/workflow/scripts/gcmt_to_realisation.py
@@ -164,8 +164,9 @@ def gcmt_to_realisation(
         Defaults to `MOST_LIKELY`.
     tectonic_type : focal_mechanism.TectonicType | None
         The tectonic type used to select the empirical ground motion models.
-        If not provided, it is classified from the solution with the NZ NSHM
-        2022 rule (see `source_modelling.focal_mechanism`).
+        If not provided, it is the most plausible type under the CatSep
+        scores of Haynie et al. (2026), computed against Slab2 (no Moho);
+        see `source_modelling.focal_mechanism`.
     solution_origin : Path | None
         If provided, use a supplied CSV of CMT solutions to lookup geometry.
         Must follow the format of the Geonet CMT solutions file.