diff --git a/src/shape/polyline.rs b/src/shape/polyline.rs
index c9781b51..46662e12 100644
--- a/src/shape/polyline.rs
+++ b/src/shape/polyline.rs
@@ -218,6 +218,7 @@ impl Polyline {
     ///   `num_indices == self.indices.len()`.
     /// - This polyline is oriented counter-clockwise.
     /// - In 3D, the polyline is assumed to be fully coplanar, on a plane with normal given by
+    ///   `axis`.
     ///
     /// These properties are not checked.
     pub fn project_local_point_assuming_solid_interior_ccw(