diff --git a/cmd/csaf_aggregator/config.go b/cmd/csaf_aggregator/config.go
index 3943a44..a389704 100644
--- a/cmd/csaf_aggregator/config.go
+++ b/cmd/csaf_aggregator/config.go
@@ -26,11 +26,12 @@ import (
 )
 
 const (
-	defaultConfigPath = "aggregator.toml"
-	defaultWorkers    = 10
-	defaultFolder     = "/var/www"
-	defaultWeb        = "/var/www/html"
-	defaultDomain     = "https://example.com"
+	defaultConfigPath     = "aggregator.toml"
+	defaultWorkers        = 10
+	defaultFolder         = "/var/www"
+	defaultWeb            = "/var/www/html"
+	defaultDomain         = "https://example.com"
+	defaultUpdateInterval = "on best effort"
 )
 
 type provider struct {
@@ -44,6 +45,9 @@ type provider struct {
 	// ServiceDocument incidates if we should create a service.json document.
 	ServiceDocument     *bool                    `toml:"create_service_document"`
 	AggregatoryCategory *csaf.AggregatorCategory `toml:"category"`
+
+	// UpdateInterval is as the mandatory `update_interval` if this is a publisher.
+	UpdateInterval *string `toml:"update_interval"`
 }
 
 type config struct {
@@ -81,6 +85,10 @@ type config struct {
 	// ServiceDocument incidates if we should create a service.json document.
 	ServiceDocument bool `toml:"create_service_document"`
 
+	// UpdateInterval is used for publishers a the mandatory field
+	// 'update_interval'.
+	UpdateInterval *string
+
 	keyMu  sync.Mutex
 	key    *crypto.Key
 	keyErr error
@@ -96,6 +104,17 @@ func (c *config) tooOldForInterims() func(time.Time) bool {
 	return func(t time.Time) bool { return t.Before(from) }
 }
 
+// updateInterval returns the update interval of a publisher.
+func (p *provider) updateInterval(c *config) string {
+	if p.UpdateInterval != nil {
+		return *p.UpdateInterval
+	}
+	if c.UpdateInterval != nil {
+		return *c.UpdateInterval
+	}
+	return defaultUpdateInterval
+}
+
 // serviceDocument tells if we should generate a service document for a
 // given provider.
 func (p *provider) serviceDocument(c *config) bool {
diff --git a/cmd/csaf_aggregator/full.go b/cmd/csaf_aggregator/full.go
index fef169c..b9b3005 100644
--- a/cmd/csaf_aggregator/full.go
+++ b/cmd/csaf_aggregator/full.go
@@ -14,6 +14,7 @@ import (
 	"log"
 	"os"
 	"path/filepath"
+	"strings"
 	"sync"
 	"time"
 
@@ -128,8 +129,8 @@ func (p *processor) full() error {
 	wg.Wait()
 
 	// Assemble aggregator data structure.
-
-	csafProviders := make([]*csaf.AggregatorCSAFProvider, 0, len(jobs))
+	var providers []*csaf.AggregatorCSAFProvider
+	var publishers []*csaf.AggregatorCSAFPublisher
 
 	for i := range jobs {
 		j := &jobs[i]
@@ -142,10 +143,21 @@ func (p *processor) full() error {
 				"error: '%s' does not produce any result.\n", j.provider.Name)
 			continue
 		}
-		csafProviders = append(csafProviders, j.aggregatorProvider)
+
+		// "https://" signals a publisher.
+		if strings.HasPrefix(j.provider.Domain, "https://") {
+			pub := &csaf.AggregatorCSAFPublisher{
+				Metadata:       j.aggregatorProvider.Metadata,
+				Mirrors:        j.aggregatorProvider.Mirrors,
+				UpdateInterval: j.provider.updateInterval(p.cfg),
+			}
+			publishers = append(publishers, pub)
+		} else {
+			providers = append(providers, j.aggregatorProvider)
+		}
 	}
 
-	if len(csafProviders) == 0 {
+	if len(providers)+len(publishers) == 0 {
 		return errors.New("all jobs failed, stopping")
 	}
 
@@ -156,11 +168,12 @@ func (p *processor) full() error {
 	lastUpdated := csaf.TimeStamp(time.Now().UTC())
 
 	agg := csaf.Aggregator{
-		Aggregator:    &p.cfg.Aggregator,
-		Version:       &version,
-		CanonicalURL:  &canonicalURL,
-		CSAFProviders: csafProviders,
-		LastUpdated:   &lastUpdated,
+		Aggregator:     &p.cfg.Aggregator,
+		Version:        &version,
+		CanonicalURL:   &canonicalURL,
+		CSAFProviders:  providers,
+		CSAFPublishers: publishers,
+		LastUpdated:    &lastUpdated,
 	}
 
 	web := filepath.Join(p.cfg.Web, ".well-known", "csaf-aggregator")
diff --git a/csaf/models.go b/csaf/models.go
index 8935d41..efc2229 100644
--- a/csaf/models.go
+++ b/csaf/models.go
@@ -218,13 +218,21 @@ type AggregatorCSAFProvider struct {
 	Mirrors  []ProviderURL                   `json:"mirrors,omitempty"`  // required
 }
 
+// AggregatorCSAFPublisher reflects one publisher in an aggregator.
+type AggregatorCSAFPublisher struct {
+	Metadata       *AggregatorCSAFProviderMetadata `json:"metadata,omitempty"`        // required
+	Mirrors        []ProviderURL                   `json:"mirrors,omitempty"`         // required
+	UpdateInterval string                          `json:"update_interval,omitempty"` // required
+}
+
 // Aggregator is the CSAF Aggregator.
 type Aggregator struct {
-	Aggregator    *AggregatorInfo           `json:"aggregator,omitempty"`         // required
-	Version       *AggregatorVersion        `json:"aggregator_version,omitempty"` // required
-	CanonicalURL  *AggregatorURL            `json:"canonical_url,omitempty"`      // required
-	CSAFProviders []*AggregatorCSAFProvider `json:"csaf_providers,omitempty"`     // required
-	LastUpdated   *TimeStamp                `json:"last_updated,omitempty"`       // required
+	Aggregator     *AggregatorInfo            `json:"aggregator,omitempty"`         // required
+	Version        *AggregatorVersion         `json:"aggregator_version,omitempty"` // required
+	CanonicalURL   *AggregatorURL             `json:"canonical_url,omitempty"`      // required
+	CSAFProviders  []*AggregatorCSAFProvider  `json:"csaf_providers,omitempty"`     // required
+	CSAFPublishers []*AggregatorCSAFPublisher `json:"csaf_publishers,omitempty"`
+	LastUpdated    *TimeStamp                 `json:"last_updated,omitempty"` // required
 }
 
 // Validate validates the current state of the AggregatorCategory.