Added pixi note that setup.sh uses pip install

Author: seanlaw

pyproject.toml

@@ -106,7 +106,9 @@ twine = "*"
 python-build = "*"  # Equivalent to PyPI `build` package
 
 [tool.pixi.activation]
-# Always execute ./setup.sh when activating the default environment
+# Always execute ./setup.sh when activating the default environment.
+# Note that `stumpy` will only be listed via `pip list | grep stumpy`
+# and not via `pixi list | grep stumpy` since `pip install .` is used!
 scripts = ["setup.sh"]
 
 [tool.pixi.target.linux-64.dependencies]