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diff --git a/doc/functions/TIFFFieldSetGetCountSize.rst b/doc/functions/TIFFFieldSetGetCountSize.rst
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+TIFFFieldSetGetCountSize
+========================
+
+Synopsis
+--------
+
+.. highlight:: c
+
+::
+
+    #include <tiffio.h>
+
+.. c:function:: int TIFFFieldSetGetCountSize(const TIFFField* fip)
+
+Description
+-----------
+
+:c:func:`TIFFFieldGetSetSize` returns the size of the count parameter of the field.
+
+:c:var:`fip` is a field information pointer previously returned by
+:c:func:`TIFFFindField`,
+:c:func:`TIFFFieldWithTag`,
+:c:func:`TIFFFieldWithName`.
+
+Return values
+-------------
+
+:c:func:`TIFFFieldGetSizeSize` returns the datatype size of the count parameter, or zero if the
+:c:var:`fip` pointer was NULL or the type was invalid.  The size will be 2 if the type is
+:c:type:`uint16_t`, or 4 is the type is :c:type:`uint32_t`.
+
+See also
+--------
+
+:doc:`libtiff`