diff --git a/Documentation/docs/design_documents/VTKFileFormats.md b/Documentation/docs/design_documents/VTKFileFormats.md
index f54e715a3fadf7c9bba4b49faa34e6e6931d7239..d51ec5052266b03753d40b6339c58a691ad7ee0a 100644
--- a/Documentation/docs/design_documents/VTKFileFormats.md
+++ b/Documentation/docs/design_documents/VTKFileFormats.md
@@ -1087,7 +1087,7 @@ offset.
 
 ### Poly data
 
-The format for unstructured grid is shown in Figure 8. In this case
+The format for poly data is shown in Figure 8. In this case
 the `Type` attribute of the `VTKHDF` group is `PolyData`.
 The poly data is split into partitions, with a partition for
 each MPI rank. This is reflected in the HDF5 file structure. Each HDF