diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..db67ce9
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,27 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  pypi-publish:
+    name: Upload release to PyPI
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/p/python-hdwallet-slip39
+    permissions:
+      id-token: write  # IMPORTANT: this permission is mandatory for trusted publishing
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Set up Python
+      uses: actions/setup-python@v4
+    - name: Build
+      run: |
+        python -m pip install -r requirements-dev.txt
+        python -m build .
+    - name: Publish package distributions to PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1
diff --git a/GNUmakefile b/GNUmakefile
index 3b423f5..17b5862 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -12,6 +12,8 @@ VENV_NAME	= $(GHUB_NAME)-$(VERSION)-$(PY3_V)
 VENV		= $(VENV_DIR)/$(VENV_NAME)
 VENV_OPTS	=
 
+NIX_OPTS	?= # --pure
+
 .PHONY:			all test build build-check wheel install-dev install clean FORCE
 
 all:			build
@@ -27,7 +29,7 @@ unit-%:
 	$(PY3TEST) -k $*
 
 nix-%:
-	nix-shell --pure --run "make $*"
+	nix-shell $(NIX_OPTS) --run "make $*"
 
 build:			clean wheel
 
diff --git a/README.md b/README.md
index 6bb9af3..2519395 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,15 @@
 # Hierarchical Deterministic Wallet
 
+> Note: This hdwallet-slip39 package is a temporary upgrade shim for the great hdwallet package
+> https://pypi.org/project/hdwallet/.
+
+> Use it only until the upstream hdwallet package merges support for BSC, Nix, etc in :
+> https://github.com/meherett/python-hdwallet/pull/1020
+
+> Until then, substitute "hdwallet-slip39" for "hdwallet" in your "pip install" or requirements.txt
+> Both supply the hdwallet package, eg. "import hdwallet".  Specify version >= 2.3 to ensure you are
+> using this shim.
+
 [![Build Status](https://app.travis-ci.com/meherett/python-hdwallet.svg?branch=master)](https://app.travis-ci.com/meherett/python-hdwallet)
 [![PyPI Version](https://img.shields.io/pypi/v/hdwallet.svg?color=blue)](https://pypi.org/project/hdwallet)
 [![Documentation Status](https://readthedocs.org/projects/hdwallet/badge/?version=master)](https://hdwallet.readthedocs.io)