diff --git a/README.md b/README.md
index 94a566a..5858259 100644
--- a/README.md
+++ b/README.md
@@ -24,4 +24,16 @@
 * `abra app config <app-name>`
 * `abra app deploy <app-name>`
 
+## Customization
+
+Run this command after every deploy/upgrade:
+
+`abra app command --local <app-name> customize <assets_path>`
+
+This command replaces the background image, the logo and the favicon with the following files placed in the `<assets_path>` directory:
+* `flow_background.jpg`
+* `icon_left_brand.svg`
+* `icon.png`
+
+
 For more, see [`docs.coopcloud.tech`](https://docs.coopcloud.tech).
diff --git a/abra.sh b/abra.sh
index 580f2f2..5565cb8 100644
--- a/abra.sh
+++ b/abra.sh
@@ -1,2 +1,26 @@
 export CUSTOM_CSS_VERSION=v2
 export CUSTOM_FLOWS_VERSION=v1
+
+customize() {
+    if [ -z "$1" ]
+    then
+            echo "Usage: ... customize <assets_path>"
+            exit 1
+    fi
+    # TODO: use env to specify source and target files
+    if [ -e $1/flow_background.jpg ]
+    then
+        echo copy flow_background.jpg
+        abra app cp $APP_NAME $1/flow_background.jpg app:/web/dist/assets/images/
+    fi
+    if [ -e $1/icon_left_brand.svg ]
+    then
+        echo copy icon_left_brand.svg
+        abra app cp $APP_NAME $1/icon_left_brand.svg app:/web/dist/assets/icons/
+    fi
+    if [ -e $1/icon.png ]
+    then
+        echo copy icon.png
+        abra app cp $APP_NAME $1/icon.png app:/web/dist/assets/icons/
+    fi
+}