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-rw-r--r--docs/source/operations/transformations/hgridshift.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/source/operations/transformations/hgridshift.rst b/docs/source/operations/transformations/hgridshift.rst
index b1125f07..51431919 100644
--- a/docs/source/operations/transformations/hgridshift.rst
+++ b/docs/source/operations/transformations/hgridshift.rst
@@ -104,6 +104,9 @@ Required
Comma-separated list of grids to load. If a grid is prefixed by an `@` the
grid is considered optional and PROJ will the not complain if the grid is
not available.
+
+ If a grid is specified with a path that contains spaces, the value should
+ be quoted. e.g. `+grids="/my path/has/spaces.gsb"`
Grids are expected to be in CTable2, NTv1 or NTv2 format.