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diff --git a/docs/source/usage/operations/transformations/vgridshift.rst b/docs/source/usage/operations/transformations/vgridshift.rst
index f48d40c8..272b24ab 100644
--- a/docs/source/usage/operations/transformations/vgridshift.rst
+++ b/docs/source/usage/operations/transformations/vgridshift.rst
@@ -6,11 +6,15 @@ Vertical grid shift
Change Vertical datum change by grid shift
-+--------------+--------------------------------------------------------------------+
-| **Options** |
-+--------------+--------------------------------------------------------------------+
-| `+grids` | Comma-separated list of grids to load. |
-+--------------+--------------------------------------------------------------------+
++-----------------+--------------------------------------------------------------------+
+| **Input type** | Geodetic coordinates (horizontal), meters (vertical). |
++-----------------+--------------------------------------------------------------------+
+| **Output type** | Geodetic coordinates (horizontal), meters (vertical). |
++-----------------+--------------------------------------------------------------------+
+| **Options** |
++-----------------+--------------------------------------------------------------------+
+| `+grids` | Comma-separated list of grids to load. |
++-----------------+--------------------------------------------------------------------+
The vertical grid shift is done by offsetting the vertical input coordinates by
a specific amount determined by the loaded grids. The simplest use case of the