diff --git a/README.md b/README.md
index b19e8d4..48aa15e 100644
--- a/README.md
+++ b/README.md
@@ -1,21 +1,31 @@
 # Node.js Linux Installer
 This is a universal Node.js installer for Linux. The [original project by taaem](https://github.com/taaem/nodejs-linux-installer) required some fixes to maintain functionality, which are contained in this fork, together with a few enhancements.
 
-[![CodeFactor](https://www.codefactor.io/repository/github/michaing/nodejs-linux-installer/badge)](https://www.codefactor.io/repository/github/michaing/nodejs-linux-installer)
-
 The following architectures are currently supported:
 - ARMv6 (armv6l)
 - ARMv7 (armv7l)
 - ARMv8 (aarch64)
 - x86 64-bit (x86_64)
 - x86 32-bit (i386, i486, i586, i686)
+- further architectures from [nodejs.org's unofficial builds](unofficial-builds.nodejs.org).
 
 **I don't take any responsibilities if you blow your system up!**
 
-### Installing
-```
-curl -sSf https://raw.githubusercontent.com/MichaIng/nodejs-linux-installer/master/node-install.sh | bash
-```
+### Usage
+Please be aware, that installation of node requires root privileges. The script will ask for sudo credentials before installation.
+
+Get the help text:
+
+    curl -sSf https://raw.githubusercontent.com/ollliegits/nodejs-linux-installer/master/node-install.sh | bash -s -- --help
+
+Show a list of all unofficial releases for your CPU architecture available from nodejs.org :
+
+    curl -sSf https://raw.githubusercontent.com/ollliegits/nodejs-linux-installer/master/node-install.sh | bash -s -- --list-unofficial-releases
+
+Install unofficial release of node.js with `<version>`:
+
+    curl -sSf https://raw.githubusercontent.com/ollliegits/nodejs-linux-installer/master/node-install.sh | bash -s -- --unofficial-version <version>
+
 
 ### Contributing
 Just create a fork and please contribute all your improvements back here!
diff --git a/node-install.sh b/node-install.sh
index 2898a8d..d5c9c79 100755
--- a/node-install.sh
+++ b/node-install.sh
@@ -1,6 +1,47 @@
 #!/bin/bash
 
-echo 'Node.js Linux Installer by github.com/taaem, updated by github.com/MichaIng'
+show_help() {
+    cat <<END
+Universal Node.js installer for Linux. Original project by taaem (github.com/taaem/nodejs-linux-installer) and 
+    MichaIng (github.com/MichaIng/nodejs-linux-installer).
+
+Use this script to install latest version available for your CPU architecture.
+
+Usage: node-install.sh [<params>]
+
+Parameters:
+    -lu
+    --list-unofficial-releases          List all available versions in nodejs.org's unofficial builds.
+    
+    -u <version>
+    --unofficial-version <version>      Install <version> from nodejs.org's unofficial builds at 
+                                        unofficial-builds.nodejs.org/download/release/. E.g. 'v15.5.1'.
+
+END
+}
+
+list_available() {
+    curl -l "https://unofficial-builds.nodejs.org/download/release/index.json" 2>>/dev/null | jq -r '.[].version' | sort -Vr
+}
+
+
+# getting options
+while [[ "$1" =~ ^- && ! "$1" == "--" ]]; do case $1 in
+  -h | --help )
+    show_help
+    exit
+    ;;
+  -lu | --list-unofficial-releases )
+    list_available
+    exit
+    ;;
+  -u | --unofficial-version )
+    shift; unofficial_build_version=$1
+    [[ -z "$unofficial_build_version" ]] && echo "Specify the version to install when using the --unofficial-build-version flag." && exit 1
+    ;;
+esac; shift; done
+if [[ "$1" == '--' ]]; then shift; fi
+
 if [[ $EUID != 0 ]]
     then
         echo 'root permissions required for installing Node.js'
@@ -16,9 +57,17 @@ if [[ $EUID != 0 ]]
 fi
 
 ARCH=$(uname -m)
-echo "Searching latest stable version for $ARCH ..."
-URL='https://nodejs.org/dist/'
-if [[ $ARCH == 'aarch64' ]]
+
+if [[ ! -z "$unofficial_build_version" ]]; then
+    echo "Searching version $unofficial_build_version for $ARCH ..."
+    URL="https://unofficial-builds.nodejs.org/download/release/${unofficial_build_version}/"
+    NAME="node-${unofficial_build_version}-linux-${ARCH}.tar.gz"
+    curl --output /dev/null --silent --head --fail "${URL}${NAME}" || NAME='' # check if file exists
+    NAME="\"$NAME" # add double quote sign to mimic logic from original script block below.
+else
+    echo "Searching latest stable version for $ARCH ..."
+    URL='https://nodejs.org/dist/'
+    if [[ $ARCH == 'aarch64' ]]
     then
         URL+='latest/'
         NAME=$(curl -sSf "$URL" | grep -o '"node-v[0-9.]*-linux-arm64.tar.gz')
@@ -42,6 +91,7 @@ if [[ $ARCH == 'aarch64' ]]
     then
         URL+='latest-v9.x/'
         NAME=$(curl -sSf "$URL" | grep -o '"node-v[0-9.]*-linux-x86.tar.gz')
+    fi
 fi
 VER=${NAME:1}
 if [[ ! $VER ]]