diff --git a/README.md b/README.md
index cb47061..2283448 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,12 @@ PDF file.
   to your needs.
 * Run it: `python3 ./main.py`. Head to `http://localhost:8080` to see it live.
 
+With the default configuration, it will forward uploaded papers to CERMINE
+API, which is really slow and puts a lot of charge on these servers. You
+should download an executable JAR from [their
+repo](http://maven.icm.edu.pl/artifactory/simple/kdd-releases/pl/edu/icm/cermine/cermine-impl/)
+to your server and indicate the path to this JAR file in the `config.py` file.
+
 
 ## LICENSE