diff --git a/README.md b/README.md
index 21422014d..69049e8e6 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ If you need to set the heap size, you can do so using:
 
 If you want to test it with your own ontology, copy the OWL or RDFS ontology file to the `testcases` folder (which is
 mounted in Docker). Then make a new config file for your ontology in `dataload/configs` (you can use `efo.json` as a
-template). For the `ontology_purl` property in the config, use e.g. `file:///opt/dataload/testcases/myontology.owl` if
+template). For the `ontology_purl` property in the config, use e.g. `file:////opt/ols/dataload/testcases/myontology.owl` if
 your ontology is in `testcases/myontology.owl`. Then follow the above steps for efo with the config filename you
 created.