diff --git a/Dockerfile b/Dockerfile
index dbb8b0a..6791080 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -41,8 +41,9 @@ COPY php-fpm.conf /etc/php7/php-fpm.conf
 COPY opcache.ini /etc/php7/conf.d/00_opcache.ini
 COPY supervisord.conf /etc/supervisor/supervisord.conf
 COPY startup /usr/local/bin/startup
+COPY composer /usr/local/bin/composeur
 
-RUN chmod +x /usr/local/bin/startup
+RUN chmod +x /usr/local/bin/*
 
 VOLUME /flarum/app/assets
 EXPOSE 8080
diff --git a/README.md b/README.md
index 14aa9b2..2441047 100644
--- a/README.md
+++ b/README.md
@@ -122,6 +122,28 @@ docker-compose up -d
 * **Username** : *admin*
 * **Password** : *password*
 
+### Install custom extensions
+
+**Flarum extensions list :** https://packagist.org/search/?q=flarum-ext
+
+#### Install an extension
+
+```
+docker exec -ti flarum composeur require some/extension
+```
+
+#### Remove an extension
+
+```
+docker exec -ti flarum composeur remove some/extension
+```
+
+#### List all extensions
+
+```
+docker exec -ti flarum composeur list
+```
+
 ### Screenshot
 
 ![flarum](https://i.imgur.com/teqg3od.pngP)
diff --git a/composer b/composer
new file mode 100644
index 0000000..4363fa4
--- /dev/null
+++ b/composer
@@ -0,0 +1,57 @@
+#!/bin/sh
+
+# COMPOSER WRAPUP SCRIPT
+# This script allow to add new extensions to flarum
+
+CSI="\033["
+CEND="${CSI}0m"
+CRED="${CSI}1;31m"
+CGREEN="${CSI}1;32m"
+
+# Composer cache dir and packages list paths
+CACHE_DIR=/flarum/app/assets/.extensions
+LIST_FILE=assets/.extensions/list
+
+# Cmd ARGS
+action=$1
+package=$2
+
+# Move to flarum folder
+cd /flarum/app
+
+# Create custom extensions cache folder
+su-exec flarum:flarum mkdir -p "$CACHE_DIR"
+
+case "$action" in
+  # Install a flarum extension
+  "require")
+    COMPOSER_CACHE_DIR="$CACHE_DIR" su-exec flarum:flarum composer require "$package"
+    if [ $? -eq 0 ]; then
+      echo "$package" >> "$LIST_FILE"
+      echo -e "\n${CGREEN}${package} added to flarum.${CEND}"
+      # Remove duplicate packages
+      sort -u -o "$LIST_FILE" "$LIST_FILE"
+    else
+      echo -e "\n${CRED}/!\ An error has occurred...${CEND}"
+    fi
+    ;;
+  # Remove a flarum extension
+  "remove")
+    COMPOSER_CACHE_DIR="$CACHE_DIR" su-exec flarum:flarum composer remove "$package"
+    if [ $? -eq 0 ]; then
+      sed -i "\|${package}|d" "$LIST_FILE"
+      echo -e "\n${CGREEN}${package} removed from flarum${CEND}"
+    else
+      echo -e "\n${CRED}/!\ An error has occurred...${CEND}"
+    fi
+    ;;
+  "list")
+    cat "$LIST_FILE"
+    ;;
+  # Other composer action
+  *)
+    COMPOSER_CACHE_DIR="$CACHE_DIR" su-exec flarum:flarum composer "$@"
+    ;;
+esac
+
+exit 0
diff --git a/startup b/startup
index e5e95a9..e22ea02 100644
--- a/startup
+++ b/startup
@@ -86,6 +86,20 @@ else
   # Init flarum (without steps above)
   su-exec flarum:flarum php flarum install --file config.yml
 
+  # Composer cache dir and packages list paths
+  CACHE_DIR=/flarum/app/assets/.extensions
+  LIST_FILE=assets/.extensions/list
+
+  # Download extra extensions installed with composer wrapup script
+  if [ -s "$LIST_FILE" ]; then
+    echo "[INFO] Install extra bundled extensions"
+    while read extension; do
+      echo "[INFO] -------------- Install extension : ${extension} --------------"
+      COMPOSER_CACHE_DIR="$CACHE_DIR" su-exec flarum:flarum composer require "$extension"
+    done < "$LIST_FILE"
+    echo "[INFO] Install extra bundled extensions. DONE."
+  fi
+
   echo "[INFO] Init done, launch flarum..."
 
 fi