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diff --git a/vcl/README b/vcl/README
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@@ -188,3 +188,11 @@ other programs, use the "pdfunzip" tool:
LD_LIBRARY_PATH=$PWD/instdir/ure/lib workdir/LinkTarget/Executable/pdfunzip input.pdf output.pdf
+=== DeviceCoordinate ===
+
+The type DeviceCoordinate is meant to represent coordinate in the native Device space
+The implementation is platform dependant. it is a scalar type, but can by int/long/float/double...
+Originally such coordinate was represented with int or long... DeviceCoordinate
+was introduced to allow for sub-point coordiante (iow float/double), which is
+quite important when dealing with HiDPI devices.
+