diff --git a/README.md b/README.md
index e8136c8..6a6000c 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 dinglehopper
 ============
 
-dinglehopper is an OCR evaluation tool and reads ALTO, PAGE and text files.
+dinglehopper is an OCR evaluation tool and reads [ALTO](https://github.com/altoxml), [PAGE](https://github.com/PRImA-Research-Lab/PAGE-XML) and text files.
 
 ![Travis CI badge](https://api.travis-ci.org/qurator-spk/dinglehopper.svg?branch=master)