diff --git a/README.md b/README.md
index e312f0b..691e313 100644
--- a/README.md
+++ b/README.md
@@ -16,11 +16,11 @@ Note that this repository contains code to build different sites with some share
 - **playground/** – This directory contains anything that shouldn't be included directly but might be relevant to the project.
 - **sites/** – Each site gets a subdirectory here containing its content.
   - **<name>**
-    - **_assets/** – Site-specific static content. This will also be copied into the `assets` directory of the final output.
-    - **_data/** – Directory for Eleventy [global data files](https://www.11ty.dev/docs/data-global/).
-    - **_images/** – Place images that should be rendered by the build system in some way here.
+    - **\_assets/** – Site-specific static content. This will also be copied into the `assets` directory of the final output.
+    - **\_data/** – Directory for Eleventy [global data files](https://www.11ty.dev/docs/data-global/).
+    - **\_images/** – Place images that should be rendered by the build system in some way here.
     - **httpd.conf** – Configuration file for [lighttpd](https://redmine.lighttpd.net/projects/lighttpd/wiki#Documentation), which will serve the final site.
-    - *Anything else* is actual content for the site (usually in the form of markdown files).
+    - _Anything else_ is actual content for the site (usually in the form of markdown files).
 - **styles/** – SCSS stylesheets. Anything directly in this directory that doesn't begin with an underscore will be available in the final build.
 - **.eleventy.js** – Base Eleventy configuration. This is set up so that the correct paths for the selected site (according to the environment variable `SITE`) are selected automatically.
 - **.eleventyignore** – Eleventy ignore file. Place paths in here that should be excluded in the final build.
@@ -58,3 +58,17 @@ The flake also contains a second package for building the production output:
 ```shell
 nix build  # Will create an output derivation in 'result'
 ```
+
+## Deployment
+
+Deploy the container from the image automatically by the CI server.
+Ask @yrd for the URL.
+
+The container will expose the site under port 80.
+Further configuration is available via environment variables.
+
+- `ZAMMAD_URL=https://ticket.z31.it` – URL of the Zammad server to use.
+- `ZAMMAD_GROUP=` – Set this variable to override the group all Zammad tickets go in. If empty (the default), different forms will be sorted into different groups.
+- `ZAMMAD_TOKEN` – This is the only mandatory option. Set it to a Zammad access token with the `ticket.agent` permission.
+
+See https://codeberg.org/angestoepselt/homepage/issues/6#issuecomment-419104 for details.
diff --git a/cgi-bin/form.py b/cgi-bin/form.py
index ddb8694..c7faa9a 100755
--- a/cgi-bin/form.py
+++ b/cgi-bin/form.py
@@ -137,6 +137,8 @@ ticket_details = collections.OrderedDict()
 ticket_details["Kontaktperson"] = contact_name
 ticket_details["Email"] = contact_email
 
+form_group = "csw-Allgemein"
+
 match request_uri:
 	case "/kontakt":
 		form_name = "Allgemein"
@@ -152,6 +154,7 @@ match request_uri:
 
 	case "/computer-beantragen/organisation":
 		form_name = "Computerantrag (Organisation)"
+		form_group = "csw-Anfragen"
 		ticket_details["Organisation"] = get_form_value("organization")
 		ticket_details["Adresse"] = get_form_value("addressline")
 		ticket_details["PLZ"] = get_form_value("postalcode")
@@ -162,6 +165,7 @@ match request_uri:
 
 	case "/computer-beantragen/privat":
 		form_name = "Computerantrag (privat)"
+		form_group = "csw-Anfragen"
 		ticket_details["Adresse"] = get_form_value("addressline")
 		ticket_details["PLZ"] = get_form_value("postalcode")
 		ticket_details["Stadt"] = get_form_value("city")
@@ -172,11 +176,13 @@ match request_uri:
 
 	case "/hardware-spenden/organisation":
 		form_name = "Hardwarespende (Organisation)"
+		form_group = "csw-Hardwarespenden"
 		ticket_details["Organisation"] = get_form_value("organization")
 		attachment = get_form_value("inventory", cast=bytes)
 
 	case "/hardware-spenden/privat/laptop":
 		form_name = "Laptopspende (privat)"
+		form_group = "csw-Hardwarespenden"
 		ticket_details["Gerätedetails"] = get_form_value("device")
 
 	case _:
@@ -186,10 +192,12 @@ match request_uri:
 
 ticket_details["Kontaktformular"] = form_name
 
+# Allow the form group to be overriden using the environment variable (for
+# testing).
+form_group = os.environ.get("ZAMMAD_GROUP", "") or form_group
 
 ZAMMAD_URL = os.environ.get("ZAMMAD_URL", "").rstrip("/")
 ZAMMAD_TOKEN = os.environ.get("ZAMMAD_TOKEN", "")
-ZAMMAD_GROUP = os.environ.get("ZAMMAD_GROUP", "")
 session = requests.Session()
 session.headers.update(Authorization=f"Token token={ZAMMAD_TOKEN}")
 
@@ -199,7 +207,7 @@ try:
 		f"{ZAMMAD_URL}/api/v1/tickets",
 		json=dict(
 			title=f"Kontaktformular {contact_name} – {form_name}",
-			group=ZAMMAD_GROUP,
+			group=form_group,
 			customer_id=f"guess:{contact_email}",
 			article=dict(
 				type="web",
diff --git a/flake.nix b/flake.nix
index eaa58f1..8671177 100644
--- a/flake.nix
+++ b/flake.nix
@@ -59,7 +59,7 @@
 								# We need to provide these default variables because otherwise
 								# lighttpd doesn't even parse its configuration file:
 								"ZAMMAD_URL=https://ticket.z31.it"
-								"ZAMMAD_GROUP=testgruppe"
+								"ZAMMAD_GROUP="
 							];
 							ExposedPorts = {
 								"80/tcp" = {};