diff --git a/README.md b/README.md
index 857bea91..f50ca2ba 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,142 @@
 # Pytorch
 A forklet of Pytorch for my own quirky needs.
 
+* Build notes and scripts for different machines I admin.
+* CPU builds.
+* Meh ROCm AMD GPU builds.
+* Proprietary Nvidia builds.
+* Flailing at getting larger GPUs + Pytorch on ppc64le going.
+
 
 # Install
-thusly.
+thusly, on Debian stable (bookworm/12).
+
+
+# Dependencies
+Perhaps this and more:
+
+## OS
+```
+sudo apt install git build-essential libssl-dev zlib1g-dev \
+    libbz2-dev libreadline-dev libsqlite3-dev curl \
+    libncursesw5-dev xz-utils tk-dev libxml2-dev libxmlsec1-dev \
+    libffi-dev liblzma-dev \
+    python3-virtualenv python3-pip
+```
+
+## Python
+At present, seems latest Python that works happily with most Pytorch
+applications is Python 3.10.
+
+Use pyenv to manage versions, install something like:
+
+```
+# :)
+curl https://pyenv.run | bash
+```
+
+Add to `~/.bashrc`, then re-source it (logout/in or whatever):
+
+```
+export PYENV_ROOT="$HOME/.pyenv"
+command -v pyenv >/dev/null || export PATH="$PYENV_ROOT/bin:$PATH"
+eval "$(pyenv init -)"
+eval "$(pyenv virtualenv-init -)"
+```
+
+Get Python version 3.10:
+
+```
+pyenv install 3.10
+```
+
+Perhaps other versions, ala:
+
+```
+pyenv install 3.9
+pyenv install 3.11.6
+pyenv install 3.12
+pyenv install 3.13-dev
+```
+
+## Setup Pip Download Cache
+So as to not download files from the Internet multiple times from
+each machine in the cluster, a Pip download cacche can be set up
+thusly, assuming server IP 192.168.100.101, username debian:
+
+```
+mkdir -p ~/devel/devpi
+cd ~/devel/devpi
+virtualenv env
+source env/bin/activate
+pip install -U setuptools wheel pip
+pip install devpi-server devpi-web
+
+sudo mkdir /srv/devpi
+sudo chown debian:debian /srv/devpi
+
+devpi-init \
+    --serverdir /srv/devpi
+
+devpi-gen-config \
+    --host=0.0.0.0 \
+    --port 4040 \
+    --serverdir /srv/devpi \
+    --absolute-urls
+
+sudo apt install nginx
+
+sudo cp ~debian/devel/devpi/gen-config/nginx-devpi.conf /etc/nginx/sites-available/
+
+cd /etc/nginx/sites-enabled
+sudo ln -s ../sites-available/nginx-devpi.conf .
+
+sudo apt install supervisor
+sudo cp ~debian/devel/devpi/gen-config/supervisor-devpi.conf /etc/supervisor/conf.d/
+
+crontab -e
+@reboot /usr/local/sbin/supervisord -c /home/debian/etc/supervisor-devpi.conf
+
+supervisord -c gen-config/supervisord.conf
+
+sudo reboot
+
+devpi use http://192.168.100.101:4040
+
+devpi login root --password ''
+devpi user -m root password=FOO
+devpi user -l
+devpi logoff
+devpi user -c debian password=BAR email=devpi@localhost
+devpi login debian --password=BAR
+
+devpi index -c dev bases=root/pypi
+devpi use debian/dev
+devpi install pytest
+```
+
+
+## Add Pip Download Cache
+Add this to clients to use the cache:
+
+```
+mkdir -p ~/.config/pip
+cat > ~/.config/pip/pip.conf <<EOF
+[global]
+trusted-host = 192.168.100.101
+index-url = http://192.168.100.101:4040/root/pypi/+simple/
+
+[search]
+index = http://192.168.100.101:4040/root/pypi/
+EOF
+```
+
+
+# Get Deepcrayon Pytorch Repo
+```
+git clone https://spacecruft.org/deepcrayon/pytorch
+cd pytorch/
+```
 
 
 # Upstream
@@ -11,6 +144,8 @@ Main upstream:
 
 * https://github.com/pytorch/pytorch
 
+See also: `README-upstream.md`.
+
 
 # Disclaimer
 I am not a programmer.