diff --git a/templates/roles/web-app/config/README.md.j2 b/templates/roles/web-app/config/README.md.j2
new file mode 100644
index 00000000..16b6728c
--- /dev/null
+++ b/templates/roles/web-app/config/README.md.j2
@@ -0,0 +1,11 @@
+# Config
+
+The domains defined here can be customized by the system administrator. By default, they’re loaded from `../../group_vars/all/04_applications.yml`, but you can override them per application in your repository:
+
+```yaml
+applications:
+  {{ application_id }}:
+    variable_a: "test string"  # Replaces the default value
+    variable_b: {}             # Merges with the existing content
+    variable_c: []             # Replaces the default value (use caution with domains)
+```
diff --git a/templates/roles/web-app/vars/main.yml.j2 b/templates/roles/web-app/vars/main.yml.j2
index e93f0f8b..14a7fdba 100644
--- a/templates/roles/web-app/vars/main.yml.j2
+++ b/templates/roles/web-app/vars/main.yml.j2
@@ -1,2 +1,2 @@
-application_id: {{ application_id }} # ID of the application
+application_id: {{ application_id }} # ID of the application, should be the name of the role folder
 database_type:  0                    # Database type [postgres, mariadb]
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