diff --git a/cmd/generate/main.go b/cmd/generate/main.go
index 1a75723..3cb27cb 100644
--- a/cmd/generate/main.go
+++ b/cmd/generate/main.go
@@ -14,9 +14,11 @@ import (
 )
 
 type Config struct {
-	URL              string `yaml:"url"`
-	HAAuthToken      string `yaml:"ha_auth_token"`
-	HomeZoneEntityId string `yaml:"home_zone_entity_id,omitempty"` // Now optional
+	URL              string   `yaml:"url"`
+	HAAuthToken      string   `yaml:"ha_auth_token"`
+	HomeZoneEntityId string   `yaml:"home_zone_entity_id,omitempty"` // Now optional
+	IncludeDomains   []string `yaml:"include_domains,omitempty"`     // Optional list of domains to include
+	ExcludeDomains   []string `yaml:"exclude_domains,omitempty"`     // Optional list of domains to exclude
 }
 
 type Domain struct {
@@ -129,6 +131,35 @@ func generate(config Config) error {
 		}
 
 		domain := parts[0]
+
+		// Filter domains based on include/exclude lists
+		if len(config.IncludeDomains) > 0 {
+			// If include list is specified, only process listed domains
+			found := false
+			for _, includeDomain := range config.IncludeDomains {
+				if domain == includeDomain {
+					found = true
+					break
+				}
+			}
+			if !found {
+				continue
+			}
+		} else {
+			// If only exclude list is specified, skip excluded domains
+			excluded := false
+			for _, excludeDomain := range config.ExcludeDomains {
+				if domain == excludeDomain {
+					println("skipping excluded domain:", domain)
+					excluded = true
+					break
+				}
+			}
+			if excluded {
+				continue
+			}
+		}
+
 		if _, exists := domainMap[domain]; !exists {
 			domainMap[domain] = &Domain{
 				Name: toCamelCase(domain),
diff --git a/example/gen.yaml b/example/gen.yaml
index a15dad2..8c02d9a 100644
--- a/example/gen.yaml
+++ b/example/gen.yaml
@@ -1,3 +1,13 @@
 url: "http://192.168.4.67:8123"  # Replace with your Home Assistant URL
 ha_auth_token: "<token>"         # Your auth token or set HA_AUTH_TOKEN env var
 home_zone_entity_id: "zone.home" # Optional: defaults to zone.home
+
+# Optional: List of domains to include when generating constants
+# If provided, only these domains will be processed
+# Example: ["light", "switch", "climate"]
+include_domains: []
+
+# Optional: List of domains to exclude when generating constants
+# Only used if include_domains is empty
+# Example: ["device_tracker", "person"]
+exclude_domains: []