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@@ -46,6 +46,10 @@ Also mariadb and redis need to be running, see
 
 ## Development
 
+It may be useful to pull in the GN3 python modules locally. For this
+use `GN3_PYTHONPATH` environment that gets injected in
+the ./bin/genenetwork2 startup.
+
 ## Testing
 
 To have tests pass, the redis and mariadb instance should be running, because of