diff --git a/doc/Cite.xml b/doc/Cite.xml
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+ Cite 3 libvips
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+ Cite References to cite for libvips
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+ Martinez, K. and Cupitt, J. (2005) VIPS – a highly tuned image processing software architecture. In Proceedings of IEEE International Conference on Image Processing 2, pp. 574-577, Genova.
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+ Cupitt, J. and Martinez, K. (1996) VIPS: An image processing system for large images, Proc. SPIE, vol. 2663, pp. 19–28.
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diff --git a/doc/Using-vipsthumbnail.xml b/doc/Using-vipsthumbnail.xml
index a195f4ba..4d51cf56 100644
--- a/doc/Using-vipsthumbnail.xml
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The thumbnailing functionality is implemented by vips_thumbnail() and vips_thumbnail_buffer() (which thumbnails an image held as a string), see the docs for details. You can use these functions from any language with a libvips binding. For example, from PHP you could write:
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-$filename = ...;
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+$filename = "image.jpg";
$image = Vips\Image::thumbnail($filename, 200, ["height" => 200]);
$image->writeToFile("my-thumbnail.jpg");