diff --git a/documentation/diagrams.odg b/documentation/diagrams.odg
index 1c9df323..6c776d10 100755
Binary files a/documentation/diagrams.odg and b/documentation/diagrams.odg differ
diff --git a/documentation/images/vertex_boundary.png b/documentation/images/vertex_boundary.png
index 2f67682c..36f8942f 100644
Binary files a/documentation/images/vertex_boundary.png and b/documentation/images/vertex_boundary.png differ
diff --git a/documentation/subdivision_surfaces.rst b/documentation/subdivision_surfaces.rst
index 13fa5838..e0e95373 100644
--- a/documentation/subdivision_surfaces.rst
+++ b/documentation/subdivision_surfaces.rst
@@ -179,7 +179,7 @@ The following rule sets can be applied to vertex data interpolation:
 |                                  | sharp corners                                            |
 +----------------------------------+----------------------------------------------------------+
 
-On a quad example:
+On a grid example:
 
 .. image:: images/vertex_boundary.png
    :align: center