diff --git a/README.md b/README.md
index 9480cd1..048cd4c 100644
--- a/README.md
+++ b/README.md
@@ -80,6 +80,12 @@ This repository is frozen and will not accept contributions. Please fork it.
 If fork has improved the algorithm substantially, feel free to ping me, I will
 link to it in this README.
 
+Credit
+------
+
+[Nacionalinė Žemės Tarnyba](http://nzt.lt/) for the river data sets.
+
+
 License
 -------
 
diff --git a/salvis.png b/salvis.png
new file mode 100644
index 0000000..70e77b3
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