diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ Released under the [BSD-3-Clause](LICENSE).
 [5]: https://scrutinizer-ci.com/g/MontealegreLuis/phuml/?branch=master
 [6]: http://en.wikipedia.org/wiki/Unified_Modeling_Language
 [7]: http://php.net
-[8]: https://raw.githubusercontent.com/jakobwesthoff/phuml/master/docs/phuml_example_thumbnail.jpg
+[8]: https://raw.githubusercontent.com/jakobwesthoff/phuml/master/docs/phuml-example-thumbnail.png
 [9]: http://montealegreluis.com/phuml
 [10]: https://scrutinizer-ci.com/g/MontealegreLuis/phuml/badges/coverage.png?b=master
 [11]: https://scrutinizer-ci.com/g/MontealegreLuis/phuml/?branch=master
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diff --git a/index.md b/index.md
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@@ -25,8 +25,8 @@ You can take a look at the complete image by clicking [here][5].
 [1]: http://en.wikipedia.org/wiki/Unified_Modeling_Language
 [2]: http://php.net
 [3]: http://www.graphviz.org
-[4]: docs/phuml_example_thumbnail.jpg
-[5]: docs/phuml_example.png
+[4]: docs/phuml-example-thumbnail.png
+[5]: docs/phuml-example.png
 [6]: https://github.com/jakobwesthoff/phuml/tree/master/src
 [7]: https://travis-ci.org/MontealegreLuis/phuml.svg?branch=master
 [8]: https://travis-ci.org/MontealegreLuis/phuml