diff --git a/Gemfile b/Gemfile
index 5e84b5cb31..01d2252f5d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -169,6 +169,7 @@ end
 
 group :development do
   gem 'debugger-linecache'
+  gem 'rails-erd'
   gem 'foreman'
   gem 'listen'
   gem 'pry', '~> 0.13.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 9e1322f15d..ee8528624c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -203,6 +203,7 @@ GEM
       marcel (~> 1.0)
       nokogiri (~> 1.10, >= 1.10.4)
       rubyzip (>= 1.3.0, < 3)
+    choice (0.2.0)
     chronic (0.10.2)
     cliver (0.3.2)
     coderay (1.1.3)
@@ -471,6 +472,11 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
+    rails-erd (1.7.2)
+      activerecord (>= 4.2)
+      activesupport (>= 4.2)
+      choice (~> 0.2.0)
+      ruby-graphviz (~> 1.2)
     rails-html-sanitizer (1.4.3)
       loofah (~> 2.3)
     rails-i18n (7.0.5)
@@ -564,6 +570,8 @@ GEM
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.33.0, < 2.0)
+    ruby-graphviz (1.2.5)
+      rexml
     ruby-progressbar (1.11.0)
     ruby-rc4 (0.1.5)
     ruby-vips (2.1.4)
@@ -765,6 +773,7 @@ DEPENDENCIES
   rack-timeout
   rails (>= 6.1.4)
   rails-controller-testing
+  rails-erd
   rails-i18n
   rails_safe_tasks (~> 1.0)
   ransack (= 2.4.2)
diff --git a/doc/erd.pdf b/doc/erd.pdf
new file mode 100644
index 0000000000..4b4299cc51
Binary files /dev/null and b/doc/erd.pdf differ
diff --git a/script/erd b/script/erd
new file mode 100755
index 0000000000..ded7311b3f
--- /dev/null
+++ b/script/erd
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+# * [Pre-requisites](https://voormedia.github.io/rails-erd/install.html).
+# * [Usage](https://voormedia.github.io/rails-erd/customise.html)
+
+TITLE="Openfoodnetwork domain model - generated `date +%Y-%m-%d`"
+
+rake erd title="$TITLE" filename="doc/erd"
diff --git a/script/install-bundler b/script/install-bundler
index a5c994c311..f018f7c734 100755
--- a/script/install-bundler
+++ b/script/install-bundler
@@ -14,12 +14,12 @@
 # Fail if a single command fails.
 set -e
 
-# `grep -m 1`: find the first occurrence of "BUNDLED WITH"
+# `grep`:      find the occurrences of "BUNDLED WITH" (-m is unnecessary and behaves different on macOS)
 # `-A`:        print the next line after "BUNDLED WITH" as well
 # `-x -F`:     find exactly that string without interpreting regex
 # `tail -n 1`: take the last line, the version line
 # `tr -d`:     delete all spaces, the indent before the version
-version="$(grep -m 1 -A 1 -x -F "BUNDLED WITH" Gemfile.lock | tail -n 1  | tr -d '[:space:]')"
+version="$(grep -A 1 -x -F "BUNDLED WITH" Gemfile.lock | tail -n 1  | tr -d '[:space:]')"
 
 # if the length of $version is zero
 if [ -z "$version" ]; then