diff --git a/internal/config/config.yml b/internal/config/config.yml
index 0980cd2..8cfdb6a 100644
--- a/internal/config/config.yml
+++ b/internal/config/config.yml
@@ -39,7 +39,7 @@ http:
   # This email address can be configured here. 
   certbot_email: null
 
-  # Serve the panel also on the toplevel domain, and not only on the "_panel" domain.
+  # Serve the panel also on the toplevel domain, and not only on the "panel" domain.
   # Enabled by default.
   panel: null
 
@@ -47,7 +47,7 @@ http:
   # In the future, it will be enabled by default, but at this point it is not.
   api: null
 
-  # Enable serving the triplestore webinterface publically under the "_ts" domain
+  # Enable serving the triplestore webinterface publically under the "ts" domain
   ts: null
   
   # Enable serving the phpmyadmin webinterface publically under the "_phymyadmin" domain
diff --git a/internal/config/http.go b/internal/config/http.go
index 5b0e560..7284ed4 100644
--- a/internal/config/http.go
+++ b/internal/config/http.go
@@ -26,7 +26,7 @@ type HTTPConfig struct {
 	CertbotEmail string `yaml:"certbot_email" validate:"email"`
 
 	// Also serve the panel on the toplevel domain.
-	// Note that the panel is *always* servered under the "_panel" domain.
+	// Note that the panel is *always* servered under the "panel" domain.
 	// Disabling this is not recommended.
 	Panel validators.NullableBool `yaml:"panel" validate:"bool" default:"true"`
 
@@ -113,8 +113,16 @@ var (
 	PHPMyAdminDomain  SpecialDomain = "phpmyadmin"
 )
 
+var RestrictedSlugs = []string{
+	"www",
+	"admin",
+	PanelDomain.Domain(),
+	TriplestoreDomain.Domain(),
+	PHPMyAdminDomain.Domain(),
+}
+
 func (sd SpecialDomain) Domain() string {
-	return "_" + string(sd)
+	return string(sd)
 }
 
 // Domains adds the given subdomain to the primary and alias domains.
diff --git a/internal/dis/component/instances/create.go b/internal/dis/component/instances/create.go
index 01f137f..0cb67e3 100644
--- a/internal/dis/component/instances/create.go
+++ b/internal/dis/component/instances/create.go
@@ -5,6 +5,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	"github.com/FAU-CDI/wisski-distillery/internal/config"
 	"github.com/FAU-CDI/wisski-distillery/internal/config/validators"
 	"github.com/FAU-CDI/wisski-distillery/internal/models"
 	"github.com/FAU-CDI/wisski-distillery/internal/wisski"
@@ -75,8 +76,6 @@ func (instances *Instances) Create(slug string, system models.System) (wissKI *w
 	return wissKI, nil
 }
 
-var restrictedSlugs = []string{"www", "admin"}
-
 // IsValidSlug checks if slug represents a valid slug for an instance.
 func (instances *Instances) IsValidSlug(slug string) (string, error) {
 	// check that it is a slug
@@ -84,7 +83,7 @@ func (instances *Instances) IsValidSlug(slug string) (string, error) {
 	if err != nil {
 		return "", errInvalidSlug
 	}
-	for _, rs := range restrictedSlugs {
+	for _, rs := range config.RestrictedSlugs {
 		if strings.EqualFold(rs, slug) {
 			return "", errRestrictedSlug
 		}