Add description for Korapxml2krill

Change-Id: I600bbf7b409dfb3cfdd4a7053c1eadc2deac0f13
diff --git a/Readme.md b/Readme.md
index f4f3f5e..a580507 100644
--- a/Readme.md
+++ b/Readme.md
@@ -31,3 +31,14 @@
 
 ... will convert the i5 file into a KorAP-XML file using
 [tei2korapxml](https://github.com/KorAP/KorAP-XML-TEI).
+
+To convert the KorAP-XML archive in a second step
+into individual Krill JSON, the following command ...
+
+```shell
+$ docker run --rm -u root \
+  -v ${PWD}/:/kalamar/data/ korap/kalamar korapxml2krill archive \
+  -z -i /kalamar/data/mycorpus.zip -o ./data/
+```
+
+... will use [korapxml2krill](https://github.com/KorAP/KorAP-XML-Krill).