diff --git a/tutorials/mesh_generation/4_tree_mesh.py b/tutorials/mesh_generation/4_tree_mesh.py
index 094aff933..6d5b91835 100644
--- a/tutorials/mesh_generation/4_tree_mesh.py
+++ b/tutorials/mesh_generation/4_tree_mesh.py
@@ -226,7 +226,7 @@
 # The total number of cells
 nC = mesh.nC
 
-# An (nC, 2) array containing the cell-center locations
+# An (nC, 3) array containing the cell-center locations
 cc = mesh.gridCC
 
 # A boolean array specifying which cells lie on the boundary