diff --git a/020_zfs_httm.sh b/020_zfs_httm.sh
index c0bc29b..983c6c9 100644
--- a/020_zfs_httm.sh
+++ b/020_zfs_httm.sh
@@ -1,39 +1,67 @@
 #!/usr/bin/env bash
 
+# httm is an interactive, file-level Time Machine-like tool for ZFS/btrfs/NILFS2
+# at provides wrapper scripts that demonstrate how to use the httm command line:
+# - bowie.bash    displays the difference between unique snapshot versions and the live file.
+# - equine.bash   mount APFS snapshots for use with httm.
+# - nicotine.bash converts unique snapshot file versions to a $git archive.
+# - ounce.bash    snapshots the datasets of files opened by another programs. only when you have file changes outstanding, uncommitted to a snapshot already
+# - preview-bootstrap.bash  bridges httm to fzf, handles the "Preview" window functionality.
+# - zdbstat.bash  prints the underlying zdb metadata for a ZFS object.
+
 DEST=${1:-/etc/skel}
 set -x
 
 URL=raw.githubusercontent.com/
 USER=kimono-koans
 APP="httm"
-KEY="${USER}.gpg"
+KEY_HOME=/usr/share/keyrings
+KEY=${KEY_HOME}/"${USER}.gpg"
 packages="httm"
 
-echo "deb [signed-by=/etc/apt/trusted.gpg.d/${KEY}] https://${URL}/${USER}/ppa/main ./" | sudo tee /etc/apt/sources.list-available/${APP}-ppa.list 
-echo "deb-src [signed-by=/etc/apt/trusted.gpg.d/${KEY}] https://${URL}/${USER}/ppa/main ./" | sudo tee -a /etc/apt/sources.list-available/${APP}-ppa.list 
+# echo "deb [signed-by=/etc/apt/trusted.gpg.d/${KEY}] https://${URL}/${USER}/ppa/main ./" | sudo tee /etc/apt/sources.list-available/${APP}-ppa.list
+# echo "deb-src [signed-by=/etc/apt/trusted.gpg.d/${KEY}] https://${URL}/${USER}/ppa/main ./" | sudo tee -a /etc/apt/sources.list-available/${APP}-ppa.list
 
+conf_print_httm_sources() {
+  cat <<EOF
+Types: deb deb-src
+URIs: https://${URL}/${USER}/ppa/main/
+Suites: ./
+Components:
+Signed-By: ${KEY}
+EOF
+}
+conf_print_httm_sources | sudo tee /etc/apt/sources.list-available/httm-ppa.sources >/dev/null
 sudo ln -sf /etc/apt/sources.list-available/${APP}-ppa.list /etc/apt/sources.list.d/${APP}-ppa.list
 
 # Bypass apt-proxy for ${APP} packages
 if [ -d /etc/apt/apt.conf.d/02proxy ]; then
-	if [ "$(grep -q ${URL})" ]; then
-		echo "Acquire::http::Proxy { \"${URL}\" DIRECT; };" >> /etc/apt/apt.conf.d/02proxy
-	fi
+  if [ "$(grep -q ${URL})" ]; then
+    echo "Acquire::http::Proxy { \"${URL}\" DIRECT; };" >>/etc/apt/apt.conf.d/02proxy
+  fi
 else
-		echo "Acquire::http::Proxy { \"${URL}\" DIRECT; };" >> /etc/apt/apt.conf.d/02proxy
+  echo "Acquire::http::Proxy { \"${URL}\" DIRECT; };" >>/etc/apt/apt.conf.d/02proxy
 fi
 
 # broken "moved permanently"
 # curl -s --compressed https://${URL}/${USER}/ppa/main/KEY.gpg | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/${KEY} >/dev/null
+curl -Ls --compressed https://${URL}/${USER}/ppa/refs/heads/main/KEY.gpg | gpg --dearmor | sudo tee ${KEY} >/dev/null
 sudo apt update
 
 sudo apt install -y --no-install-recommends "$packages"
 
+# Using cargo
+# https://crates.io/crates/httm
+# curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+# latest="(wget -nv -O - "https://api.github.com/repos/kimono-koans/httm/releases/latest" 2>/dev/null | grep tag_name | cut -d: -f2 | cut -d'"' -f2)"
+# cargo install --locked --git https://github.com/kimono-koans/httm.git --tag "$latest"
 
 # httm --install-zsh-hot-keys puts a file in ${HOME} and includes it in the .zshrc
+# httm: zsh hot keys script: source ~/.httm-key-bindings.zsh
 # we put in the zshrc.d instead.
+# Update with :r! curl -s https://raw.githubusercontent.com/kimono-koans/httm/refs/heads/master/scripts/httm-key-bindings.zsh
 # httm/scripts/httm-key-bindings.zsh
-cat  <<"EOF" | sudo tee "${DEST}/.zshrc.d/008_httm-key-bindings.zsh"
+cat <<"EOF" | sudo tee "${DEST}/.zshrc.d/008_httm-key-bindings.zsh"
 #       ___           ___           ___           ___
 #      /\__\         /\  \         /\  \         /\__\
 #     /:/  /         \:\  \        \:\  \       /::|  |
@@ -97,7 +125,7 @@ httm-lookup-widget() {
   return $ret
 
 }
-zle     -N	        httm-lookup-widget
+zle     -N		httm-lookup-widget
 bindkey '\em'	httm-lookup-widget
 
 # ALT-s - select files on ZFS snapshots interactively
@@ -121,5 +149,5 @@ httm-select-widget() {
   return $ret
 }
 zle     -N      httm-select-widget
-bindkey '\es'   httm-select-widget%
+bindkey '\es'   httm-select-widget
 EOF