diff --git a/docs/_static/img/beam_waist.png b/docs/_static/img/beam_waist.png
index af0f0c284f..4c1adfe452 100644
Binary files a/docs/_static/img/beam_waist.png and b/docs/_static/img/beam_waist.png differ
diff --git a/tidy3d/components/source/field.py b/tidy3d/components/source/field.py
index dc40f01da3..abc7578de7 100644
--- a/tidy3d/components/source/field.py
+++ b/tidy3d/components/source/field.py
@@ -553,7 +553,7 @@ class GaussianBeam(AngledFieldSource, PlanarSource, BroadbandSource):
 
     Notes
     --------
-    If one wants the focus 'in front' of the source, a negative value of ``beam_distance`` is needed.
+    If one wants the focus 'in front' of the source, a negative value of ``waist_distance`` is needed.
 
     .. image:: ../../_static/img/beam_waist.png
         :width: 30%