diff --git a/Dockerfiles/prod/data/docker-entrypoint.d/310-custom-startup-scripts.sh b/Dockerfiles/prod/data/docker-entrypoint.d/310-custom-startup-scripts.sh
new file mode 100755
index 0000000..49d251b
--- /dev/null
+++ b/Dockerfiles/prod/data/docker-entrypoint.d/310-custom-startup-scripts.sh
@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+
+set -e
+set -u
+set -o pipefail
+
+
+############################################################
+# Functions
+############################################################
+
+###
+### Execute custom uesr-supplied scripts
+###
+execute_custom_scripts() {
+	local script_dir="${1}"
+	local debug="${2}"
+
+	if [ ! -d "${script_dir}" ]; then
+		run "mkdir -p ${script_dir}" "${debug}"
+	fi
+	script_files="$( find "${script_dir}" -type f -iname '*.sh' )"
+
+	# loop over them line by line
+	IFS='
+	'
+	for script_f in ${script_files}; do
+		script_name="$( basename "${script_f}" )"
+		log "info" "Executing custom startup script: ${script_name}" "${debug}"
+		if ! bash "${script_f}"; then
+			log "err" "Failed to execute script" "${debug}"
+			exit 1
+		fi
+	done
+}
+
+
+############################################################
+# Sanity Checks
+############################################################
+
+if ! command -v find >/dev/null 2>&1; then
+	echo "find not found, but required."
+	exit 1
+fi
+if ! command -v basename >/dev/null 2>&1; then
+	echo "basename not found, but required."
+	exit 1
+fi
diff --git a/Dockerfiles/prod/data/docker-entrypoint.sh b/Dockerfiles/prod/data/docker-entrypoint.sh
index 970820d..4f9f669 100755
--- a/Dockerfiles/prod/data/docker-entrypoint.sh
+++ b/Dockerfiles/prod/data/docker-entrypoint.sh
@@ -178,6 +178,13 @@ enable_modules "ENABLE_MODULES" "${DEBUG_LEVEL}"
 disable_modules "DISABLE_MODULES" "${DEBUG_LEVEL}"
 
 
+###
+### Run custom user supplied scripts
+###
+execute_custom_scripts "/startup.d" "${DEBUG_LEVEL}"
+
+
+###
 ###
 ### Startup
 ###
diff --git a/Dockerfiles/work/data/docker-entrypoint.sh b/Dockerfiles/work/data/docker-entrypoint.sh
index afe08bd..f1c1a49 100755
--- a/Dockerfiles/work/data/docker-entrypoint.sh
+++ b/Dockerfiles/work/data/docker-entrypoint.sh
@@ -206,6 +206,12 @@ run "chmod 0755 /shared/httpd" "${DEBUG_LEVEL}"
 update_ca_certificates "/ca" "${DEBUG_LEVEL}"
 
 
+###
+### Run custom user supplied scripts
+###
+execute_custom_scripts "/startup.d" "${DEBUG_LEVEL}"
+
+
 ###
 ### Startup
 ###
diff --git a/README.md b/README.md
index 3a889f8..40e5b3d 100644
--- a/README.md
+++ b/README.md
@@ -760,7 +760,7 @@ Have a look at the following table to see all offered volumes for each Docker im
  </thead>
  <tbody>
   <tr>
-   <td rowspan="5"><strong>prod</strong><br/><br/><strong>work</strong></td>
+   <td rowspan="6"><strong>prod</strong><br/><br/><strong>work</strong></td>
    <td><code>/etc/php-custom.d</code></td>
    <td>Mount this directory into your host computer and add custom <code>\*.ini</code> files in order to alter php behaviour.</td>
   </tr>
@@ -772,6 +772,10 @@ Have a look at the following table to see all offered volumes for each Docker im
    <td><code>/etc/php-modules.d</code></td>
    <td>Mount this directory into your host computer and add custo <code>\*.so</code> files in order to add your php modules.<br/><br/><strong>Note:</strong>Your should then also provide a custom <code>\*.ini</code> file in order to actually load your custom provided module.</td>
   </tr>
+  <tr>
+   <td><code>/startup.d</code></td>
+   <td>Any executable scripts ending by <code>\*.sh</code> found in this directory will be executed during startup. This is useful to supply additional commands (such as installing custom software) when the container starts up.</td>
+  </tr>
   <tr>
    <td><code>/var/log/php</code></td>
    <td>When setting environment variable <code>DOCKER_LOGS</code> to <code>0</code>, log files will be available under this directory.</td>