diff --git a/recipes/projected-fftpower.ipynb b/recipes/projected-fftpower.ipynb
index dc50205..f600c0e 100644
--- a/recipes/projected-fftpower.ipynb
+++ b/recipes/projected-fftpower.ipynb
@@ -88,7 +88,7 @@
    "source": [
     "# add RSD\n",
     "line_of_sight = [0,0,1]\n",
-    "cat['Position'] += cat['VelocityOffset'] * line_of_sight"
+    "cat['Position'] += transform.VelocityProjection(cat['VelocityOffset'], line_of_sight)"
    ]
   },
   {