diff --git a/README.md b/README.md
index e4149b45..4e9fd448 100644
--- a/README.md
+++ b/README.md
@@ -356,6 +356,7 @@ These examples incubate dotSCAD and dotSCAD refactors these examples. See [examp
  Signature | Description
 --|--
 [**surface/sf_curve**(levels, curve_path, ...)](https://openhome.cc/eGossip/OpenSCAD/lib3x-sf_curve.html) | curve a photo.
+**surface/sf_splines**(ctrl_pts, row_spline, column_spline) | generalized-spline surface.
 
 ## Triangle