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diff --git a/README.md b/README.md
index 6921d299..62ead0bd 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,12 @@ startup script [./bin/genenetwork2](https://github.com/genenetwork/genenetwork2/
 Also mariadb and redis need to be running, see
 [INSTALL](./doc/README.org).
 
+## 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