diff --git a/tools/deploy.md b/tools/deploy.md
index 48cf8910..00675b61 100644
--- a/tools/deploy.md
+++ b/tools/deploy.md
@@ -1,4 +1,5 @@
 ### Things to do before deploying...
 
 * [ ] Update changelog (`README.md`) and commit changes
-* [ ] Run `python tools/deploy-release.py {version}`
\ No newline at end of file
+* [ ] Run `mamba activate 313` (an environment that has build deps e.g. twine)
+* [ ] Run `python tools/deploy-release.py {version}`