diff --git a/source_modelling/rupture_propagation.py b/source_modelling/rupture_propagation.py
index d0f8853..38d37a4 100644
--- a/source_modelling/rupture_propagation.py
+++ b/source_modelling/rupture_propagation.py
@@ -512,7 +512,8 @@ def jump_points_from_rupture_tree(
     rupture_causality_tree : Tree
         A rupture causality tree.
     min_depth : float | None, optional
-        The minimum depth to consider jumping between, or ``None`` to allow jumps at all depths.
+        The minimum depth to consider jumping between, in kilometres, or
+        ``None`` to allow jumps at all depths.
 
     Returns
     -------