diff --git a/cmd/server/main.go b/cmd/server/main.go
index 8fa56f5..0596ffb 100644
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -54,7 +54,7 @@ func main() {
 	defer cancel()
 
 	go sessionStore.Cleanup(ctx, 30*time.Minute)
-	go forgejosync.SyncUnsyncedTickets(ctx, db, forgejoClient)
+	go forgejosync.SyncUnsynced(ctx, db, forgejoClient)
 
 	publicRouter := publichandlers.NewRouter(publichandlers.Dependencies{
 		DB:            db,
diff --git a/internal/sync/sync.go b/internal/sync/sync.go
index e8aad89..cf79d63 100644
--- a/internal/sync/sync.go
+++ b/internal/sync/sync.go
@@ -17,42 +17,18 @@ const (
 	maxRetries     = 10
 )
 
-// SyncUnsyncedTickets runs a background loop that finds tickets without a
-// Forgejo issue number and creates issues for them, retrying with exponential
-// backoff. It stops when ctx is cancelled or all tickets are synced.
-func SyncUnsyncedTickets(ctx context.Context, db *gorm.DB, client *forgejo.Client) {
+// SyncUnsynced runs a background loop that syncs tickets and comments
+// that are missing their Forgejo counterparts, retrying with exponential
+// backoff. It stops when ctx is cancelled or everything is synced.
+func SyncUnsynced(ctx context.Context, db *gorm.DB, client *forgejo.Client) {
 	backoff := initialBackoff
 
 	for attempt := 0; attempt < maxRetries; attempt++ {
-		var tickets []models.Ticket
-		if err := db.Preload("Repo").Preload("User").
-			Where("forgejo_issue_number IS NULL").
-			Find(&tickets).Error; err != nil {
-			log.Error().Err(err).Msg("sync: failed to query unsynced tickets")
-			if !sleep(ctx, backoff) {
-				return
-			}
-			backoff = nextBackoff(backoff)
-			continue
-		}
+		ticketsFailed := syncUnsyncedTickets(db, client)
+		commentsFailed := syncUnsyncedComments(db, client)
 
-		if len(tickets) == 0 {
-			log.Info().Msg("sync: all tickets synced")
-			return
-		}
-
-		log.Info().Int("count", len(tickets)).Msg("sync: found unsynced tickets")
-
-		allSynced := true
-		for _, ticket := range tickets {
-			if err := syncTicket(ctx, db, client, ticket); err != nil {
-				log.Error().Err(err).Str("ticket_id", ticket.ID.String()).Msg("sync: failed to sync ticket")
-				allSynced = false
-			}
-		}
-
-		if allSynced {
-			log.Info().Msg("sync: all tickets synced successfully")
+		if !ticketsFailed && !commentsFailed {
+			log.Info().Msg("sync: everything synced successfully")
 			return
 		}
 
@@ -62,11 +38,70 @@ func SyncUnsyncedTickets(ctx context.Context, db *gorm.DB, client *forgejo.Clien
 		backoff = nextBackoff(backoff)
 	}
 
-	log.Warn().Msg("sync: gave up after max retries, remaining unsynced tickets will be retried on next restart")
+	log.Warn().Msg("sync: gave up after max retries, remaining items will be retried on next restart")
 }
 
-func syncTicket(_ context.Context, db *gorm.DB, client *forgejo.Client, ticket models.Ticket) error {
-	// Look up or create the "customer" label
+// syncUnsyncedTickets syncs tickets without a Forgejo issue number.
+// Returns true if any tickets failed to sync.
+func syncUnsyncedTickets(db *gorm.DB, client *forgejo.Client) bool {
+	var tickets []models.Ticket
+	if err := db.Preload("Repo").Preload("User").
+		Where("forgejo_issue_number IS NULL").
+		Find(&tickets).Error; err != nil {
+		log.Error().Err(err).Msg("sync: failed to query unsynced tickets")
+		return true
+	}
+
+	if len(tickets) == 0 {
+		return false
+	}
+
+	log.Info().Int("count", len(tickets)).Msg("sync: found unsynced tickets")
+
+	anyFailed := false
+	for _, ticket := range tickets {
+		if err := syncTicket(db, client, ticket); err != nil {
+			log.Error().Err(err).Str("ticket_id", ticket.ID.String()).Msg("sync: failed to sync ticket")
+			anyFailed = true
+		}
+	}
+	return anyFailed
+}
+
+// syncUnsyncedComments syncs comments that belong to tickets with a Forgejo
+// issue but are missing their own Forgejo comment ID.
+// Returns true if any comments failed to sync.
+func syncUnsyncedComments(db *gorm.DB, client *forgejo.Client) bool {
+	var comments []models.TicketComment
+	if err := db.Preload("Ticket").Preload("Ticket.Repo").Preload("User").
+		Where("forgejo_comment_id IS NULL").
+		Find(&comments).Error; err != nil {
+		log.Error().Err(err).Msg("sync: failed to query unsynced comments")
+		return true
+	}
+
+	if len(comments) == 0 {
+		return false
+	}
+
+	log.Info().Int("count", len(comments)).Msg("sync: found unsynced comments")
+
+	anyFailed := false
+	for _, comment := range comments {
+		if comment.Ticket.ForgejoIssueNumber == nil {
+			// Parent ticket hasn't been synced yet; skip until next round
+			anyFailed = true
+			continue
+		}
+		if err := syncComment(db, client, comment); err != nil {
+			log.Error().Err(err).Str("comment_id", comment.ID.String()).Msg("sync: failed to sync comment")
+			anyFailed = true
+		}
+	}
+	return anyFailed
+}
+
+func syncTicket(db *gorm.DB, client *forgejo.Client, ticket models.Ticket) error {
 	var labelIDs []int64
 	label, err := client.GetOrCreateLabel(ticket.Repo.ForgejoOwner, ticket.Repo.ForgejoRepo, "customer", "#0075ca")
 	if err != nil {
@@ -92,6 +127,23 @@ func syncTicket(_ context.Context, db *gorm.DB, client *forgejo.Client, ticket m
 	return nil
 }
 
+func syncComment(db *gorm.DB, client *forgejo.Client, comment models.TicketComment) error {
+	repo := comment.Ticket.Repo
+	forgejoComment, err := client.CreateComment(repo.ForgejoOwner, repo.ForgejoRepo, *comment.Ticket.ForgejoIssueNumber, forgejo.CreateCommentRequest{
+		Body: comment.Body + "\n\n---\n*Comment by: " + comment.User.Email + "*",
+	})
+	if err != nil {
+		return err
+	}
+
+	if err := db.Model(&comment).Update("forgejo_comment_id", forgejoComment.ID).Error; err != nil {
+		return err
+	}
+
+	log.Info().Str("comment_id", comment.ID.String()).Int64("forgejo_comment_id", forgejoComment.ID).Msg("sync: comment synced")
+	return nil
+}
+
 func sleep(ctx context.Context, d time.Duration) bool {
 	select {
 	case <-ctx.Done():